State of matter and Giovanni Perricelli: Difference between pages
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A '''state of matter''' (or '''physical state''', or '''form of matter''') has physical properties which are qualitatively different from other states of matter. |
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{{MedalSport | Men’s [[Athletics (track and field)|Athletics]]}} |
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{{MedalCountry | {{ITA}} }} |
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{{MedalCompetition|[[IAAF World Championships in Athletics|World Championships]]}} |
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{{MedalSilver|[[1995 World Championships in Athletics|1995 Gothenbourg]]|50 km walk}} |
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{{MedalBottom}} |
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'''Giovanni Perricelli''' (born [[August 25]], [[1967]] in [[Milan]]) is an [[Italy|Italian]] [[race walking|race walker]]. |
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Traditionally, three states of matter were recognized: [[solid]], which maintains a fixed volume and shape; [[liquid]], which maintains a fixed volume but adopts the shape of its container; and [[gas]], which occupies the entire volume available. [[Plasma (physics)|Plasma]], or ionized gas, is a fourth state and occurs at high temperatures. |
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==Achievements== |
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Today, many other states of matter are often recognized, although there is no agreed-upon list of states, nor are there definite criteria for a new state. Some are of technological importance, such as the various [[liquid crystal]] states, the [[ferromagnetic]] state and the [[superconductive]] state. Others occur only under extreme laboratory conditions, such as the [[fermionic condensate]] and the [[quark-gluon plasma]]. This article gives a brief introduction to the main, generally accepted states, starting with the most familiar and proceeding to the most exotic. |
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{| border="1" cellspacing="2" cellpadding="1" style="border-collapse: collapse; font-size: 95%;" |
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|- bgcolor="cccccc" |
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!Year |
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!Tournament |
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!Venue |
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!Result |
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!Event |
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|- |
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|1988 |
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|[[Athletics at the 1988 Summer Olympics|Olympic Games]] |
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|[[Seoul, South Korea]] |
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|align="center" | 11th |
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|[[Athletics at the 1988 Summer Olympics - Men's 50 km walk|50 km]] |
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|- |
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|1990 |
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|[[1990 European Championships in Athletics - Men's 50 km Walk|European Championships]] |
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|[[Split]], [[Yugoslavia]] |
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|align="center" | 7th |
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|50 km |
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|- |
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|1991 |
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|[[1991 World Championships in Athletics - Men's 50 km Walk|World Championships]] |
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|[[Tokyo, Japan]] |
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|align="center" | DNF |
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|50 km |
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|- |
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|1993 |
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|[[1993 World Championships in Athletics - Men's 50 km Walk|World Championships]] |
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|[[Stuttgart, Germany]] |
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|align="center" | 13th |
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|50 km |
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|- |
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|1994 |
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|[[1994 European Championships in Athletics|European Championships]] |
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|[[Helsinki]], [[Finland]] |
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|bgcolor="cc9966" align="center" | 3rd |
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|50 km |
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|- |
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|1995 |
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|[[1995 World Championships in Athletics|World Championships]] |
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|[[Gothenburg]], [[Sweden]] |
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|bgcolor="silver" align="center" | 2nd |
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|50 km |
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|- |
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|1999 |
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|[[1999 World Championships in Athletics|World Championships]] |
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|[[Seville]], [[Spain]] |
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|align="center" | DNF |
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|50 km |
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|} |
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==External links== |
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The terms “state of matter” and [[phase (matter)|phase]] are often used interchangeably. Strictly speaking, however, a phase is a region of a macroscopic physical system with uniform chemical composition and physical properties. For uniform systems there is one only region which may be called either a state or a phase (e.g. "solid state" or "solid phase"), but for non-uniform systems the numbers of states and phases may not be equal. For example, a bottle of salad dressing may separate into an oil-rich phase and a water-rich phase; there are then two phases, both of which are in the liquid state. |
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*{{iaaf name|id=4869|name=Giovanni Perricelli}} |
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{{DEFAULTSORT:Perricelli, Giovanni}} |
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==The three classical states== |
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===Solid=== |
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{{main|Solid}} |
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[[Category:1967 births]] |
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A solid has a stable, definite shape, and a definite volume. In a solid, the particles are packed closely together. They cannot move freely, they can only vibrate. The movement energy and temperature are very low. Solids can only change their shape by force, as when broken or cut. |
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[[Category:Living people]] |
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[[Category:Italian athletes]] |
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In [[crystalline solid]]s the particles (atoms, molecules, or ions) are arranged in an ordered three-dimensional structure. There are many different [[crystal structure]]s, and the same substance can have more than one structure. For example, [[iron]] has a [[body-centred cubic]] structure at temperatures below 912°C, and a [[face-centred cubic]] structure between 912°C and 1394°C. [[Ice]] has fifteen known structures at various temperatures and pressures.i like pie and you cant do anything about it!!!! |
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[[Category:Racewalkers]] |
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[[Category:Athletes at the 1988 Summer Olympics]] |
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===Liquid=== |
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[[Category:Athletes at the 1992 Summer Olympics]] |
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{{main|Liquid}} |
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[[Category:Athletes at the 1996 Summer Olympics]] |
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[[Category:Athletes at the 2000 Summer Olympics]] |
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The shape of a liquid is not definite, but is determined by its container. The volume is definite if the [[temperature]] and [[pressure]] are constant. When a solid is heated above its [[melting point]], it becomes liquid and the [[kinetic energy]] of its particles increases. These particles are usually farther apart than in the solid (with the noteworthy exception of water, H<sub>2</sub>O), and they can slide past each other easily. The highest temperature at which a given liquid can exist is its [[critical temperature]]. |
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[[Category:Olympic athletes of Italy]] |
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===Gas=== |
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{{main|Gas}} |
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A gas has no definite shape or volume, but occupies the entire container in which it is confined. The particles of a gas are far apart from each other, and can move around quickly. A liquid may be converted to a gas by heating at constant pressure to the [[boiling point]], or else by reducing the pressure at constant temperature. |
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At temperatures below its [[critical temperature]], a gas is also called a [[vapor]], and can be liquefied by compression alone without cooling. A vapor can exist in equilibrium with a liquid (or solid), in which case the gas pressure equals the [[vapor pressure]] of the liquid (or solid). |
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A [[supercritical fluid]] (SCF) is a gas whose temperature and pressure are above the critical temperature and [[critical pressure]] respectively. It has the physical properties of a gas, but its high density confers solvent properties in some cases which lead to useful applications. For example, [[supercritical carbon dioxide]] is used to [[supercritical fluid extraction|extract]] [[caffeine]] in the manufacture of [[decaffeination|decaffeinated]] coffee. |
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===Changes in states of matter=== |
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[[Image:Phase change -pn.png|thumb|right|300px|This diagram shows the nomenclature for the different phase transitions.]] |
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'''a solid''' → '''a liquid = [[melting]]''' |
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(heat energy added) |
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e.g. ice melts to water |
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'''a liquid''' → '''a gas = [[evaporation]]''' |
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(heat energy added) |
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e.g. water to water vapour |
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'''a solid''' → '''a gas = [[Sublimation (chemistry)|sublimation]]''' |
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(heat energy added) |
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e.g. dry ice (frozen CO<sub>2</sub>) to carbon dioxide |
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'''a gas''' → '''a liquid = [[condensation]]''' |
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(heat energy removed) |
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e.g. cloud to rain |
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'''a liquid''' → '''a solid = [[freezing]]''' |
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(heat energy removed) |
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e.g. water to ice |
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'''a gas''' → '''a solid = [[Deposition (physics)|deposition]]''' |
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(heat energy removed) |
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e.g. water vapour to frost |
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==Other states at ordinary temperatures== |
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===Liquid crystal states=== |
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{{main|Liquid crystal}} |
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Liquid crystal states have properties intermediate between mobile liquids and ordered solids. For example, the [[Liquid crystal#Nematic phase|nematic phase]] consists of long rod-like molecules such as [[para-azoxyanisole]], which is nematic in the temperature range 118-136 °C.<ref>{{cite journal|title=Phase Transitions of Liquid Crystal PAA in Confined Geometries|author=Shao, Y.; Zerda, T. W.|journal=Journal of Physical Chemistry B|year=1998|volume=102|issue=18|pages=3387–3394|doi=10.1021/jp9734437}}</ref> In this state |
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the molecules flow as in a liquid, but they all point in the same direction (within each domain) and cannot rotate freely. |
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Other types of liquid crystals are described in the main article on these states. Several types have technological importance, for example in [[liquid crystal displays]]. |
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===Amorphous solid=== |
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{{main|Amorphous solid}} |
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An amorphous or non-crystalline solid has a disordered structure like a liquid. However its molecules are relatively immobile so that is usually classed as a solid. Common examples are [[glass]], [[rubber]], and [[polystyrene]] and other [[polymers]]. Many amorphous solids soften into liquids when heated above their [[glass transition temperature]]s, at which the molecules become mobile. |
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===Magnetically-ordered states=== |
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[[Transition metal]] atoms often have [[magnetic moment]]s due to the net [[spin (physics)|spin]] of electrons which remain unpaired and do not form chemical bonds. In some solids the magnetic moments on different atoms are ordered and can form a ferromagnet, an antiferromagnet or a ferrimagnet. |
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In a [[ferromagnet]] -- for instance, solid [[iron]] -- the magnetic moment on each atom is aligned in the same direction (within a [[magnetic domain]]). If the domains are also aligned, the solid is a [[permanent magnet]], which is magnetic even in the absence of an external [[magnetic field]]. The [[magnetization]] disappears when the magnet is heated to the [[Curie temperature]], which for iron is 768°C. |
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An [[antiferromagnet]] has two networks of equal and opposite magnetic moments which cancel each other out, so that the net magnetization is zero. For example, in [[nickel(II) oxide]] (NiO), half the nickel atoms have moments aligned in one direction and half in the opposite direction. |
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In a [[ferrimagnet]], the two networks of magnetic moments are opposite but unequal, so that cancellation is incomplete and there is a non-zero net magnetization. An example is [[magnetite]] (Fe<sub>3</sub>O<sub>4</sub>), which contains Fe<sup>2+</sup> and Fe<sup>3+</sup> ions with different magnetic moments. |
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==Low-temperature states== |
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===Superconductor=== |
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{{main|Superconductivity}} |
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Superconductors are materials which have zero [[electrical resistance]], and therefore perfect conductivity. They also exclude all magnetic fields from their interior, a phenomenon known as the [[Meissner effect]] or perfect [[diamagnetism]]. [[Superconducting magnets]] are used as electromagnets in [[MRI]] machines. |
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The phenomenon of superconductivity was discovered in 1911, and for 75 years was only known in some metals and metallic alloys at temperatures below 30 K. In 1986 so-called [[high-temperature superconductivity]] was discovered in certain [[ceramic]] oxides, and has now been observed in temperatures as high as 164 K (which is still well below [[room temperature]].) |
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===Bose-Einstein condensate=== |
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{{main|Bose-Einstein condensate}} |
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In 1924, [[Albert Einstein]] and [[Satyendra Bose]] predicted the "Bose-Einstein condensate," sometimes referred to as the fifth state of matter. An example is helium-4 close to absolute zero in the [[superfluid]] state, discovered in 1937, in which it will attempt to 'climb' out of its container.<ref>{{cite book|coauthors=Stephen Fry|title=The QI Book of General Ignorance|edition=3}}</ref> |
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In the gas phase, the Bose-Einstein condensate remained an unverified theoretical prediction for many years. Finally in 1995, [[Wolfgang Ketterle]] and his team of graduate students produced such a condensate experimentally. A Bose-Einstein condensate is "colder" than a solid. It occurs when atoms have very similar (or the same) [[quantum level]]s. Substances with temperatures close to [[absolute zero]] (-273 °C) will exhibit the Bose-Einstein condensate. |
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===Superfluid=== |
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{{main|Superfluids}} |
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A superfluid is a liquid, but exhibits so many other properties that many argue it is another state of matter.<ref>http://web.mit.edu/newsoffice/2005/matter.html</ref> |
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==High-energy states== |
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===Plasma (ionized gas)=== |
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{{main|Plasma (physics)}} |
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Plasma occurs when the temperature is between 1000 degrees C and 1,000,000,000 degrees C.{{Fact|date=August 2008}} Some examples of plasma are the charged air around lightning and stars, including our own [[sun]].{{Fact|date=August 2008}} |
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As a gas is heated, electrons begin to leave the atoms, resulting in the presence of free electrons, which are not bound to an atom or molecule, and ions, which are [[chemical species]] that contain unequal number of electrons and protons, and therefore possess an electrical charge. The free electric charges make the plasma electrically conductive so that it responds strongly to electromagnetic fields. At very high temperatures, such as those present in stars, it is assumed that essentially all electrons are "free," and that a very high-energy plasma is essentially bare nuclei swimming in a sea of electrons. Plasma is believed to be the most common state of matter in the universe. |
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===Quark-gluon plasma=== |
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{{main|Quark-gluon plasma}} |
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This is a state of matter discovered at the CERN in 2000<ref>[http://newstate-matter.web.cern.ch/newstate-matter/Experiments.html A New State of Matter - Experiments]</ref>, |
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in which the quarks that would normally make up protons and neutrons are freed and can be observed individually, similar to splitting molecules into atoms. This state of matter allows scientists to observe the properties of individual quarks, and not just theorize. |
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==Other proposed states== |
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{{Main|List of states of matter}} |
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===Degenerate matter=== |
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Under extremely high pressure, ordinary matter undergoes a transition to a series of exotic states of matter collectively known as [[degenerate matter]]. These are of great interest to [[astrophysics]], because these high-pressure conditions are believed to exist inside [[star]]s that have used up their [[nuclear fusion]] "fuel", such as [[White dwarf|white dwarves]] and [[neutron star]]s. |
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===Supersolid=== |
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{{main|Supersolid}} |
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A supersolid is a solid, but exhibits so many other properties that many argue it is another state of matter.<ref>http://prola.aps.org/abstract/PRB/v55/i5/p3104_1</ref> |
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===String-net liquid=== |
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When in a normal solid state, the atoms of matter align themselves in a grid pattern, so that the spin of any electron is the opposite of the spin of all electrons touching it. But in a [[string-net liquid]], atoms are arranged in some pattern which would require some electrons to have neighbors with the same spin. This gives rise to some curious properties, as well as supporting some unusual proposals about the fundamental conditions of the universe itself. |
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===Rydberg matter=== |
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One of the metastable states of strongly non-ideal plasma is [[Rydberg matter]], which forms upon condensation of excited atoms. These atoms can also turn into ions and electrons if they reach a certain temperature. |
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== See also == |
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* [[Phase (matter)]] |
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* [[Condensed matter physics]] |
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* [[Cooling curve]] |
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* [[Supercooling]] |
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* [[Superheating]] |
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==References== |
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<references/> |
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{{Refimprove|date=September 2008}} |
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==External links== |
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*[http://web.mit.edu/newsoffice/2005/matter.html 2005-06-22, MIT News: MIT physicists create new form of matter] Citat: "... They have become the first to create a new type of matter, a gas of atoms that shows high-temperature superfluidity." |
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*[http://www.sciencedaily.com/releases/2003/10/031010075634.htm 2003-10-10, Science Daily: Metallic Phase For Bosons Implies New State Of Matter] |
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*[http://www.sciencedaily.com/releases/2004/01/040115074553.htm 2004-01-15, ScienceDaily: Probable Discovery Of A New, Supersolid, Phase Of Matter] Citat: "...We apparently have observed, for the first time, a solid material with the characteristics of a superfluid...but because all its particles are in the identical quantum state, it remains a solid even though its component particles are continually flowing..." |
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*[http://www.sciencedaily.com/releases/2004/01/040129073547.htm 2004-01-29, ScienceDaily: NIST/University Of Colorado Scientists Create New Form Of Matter: A Fermionic Condensate] |
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{{State of matter}} |
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{{Italy-athletics-bio-stub}} |
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[[Category:Condensed matter physics]] |
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[[Category:Chemical engineering]] |
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[[Category:Phases of matter| ]] |
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Revision as of 21:05, 10 October 2008
| Medal record | ||
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| Men’s Athletics | ||
Representing  Italy
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| World Championships | ||
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1995 Gothenbourg | 50 km walk |
Giovanni Perricelli (born August 25, 1967 in Milan) is an Italian race walker.
Achievements
| Year | Tournament | Venue | Result | Event |
|---|---|---|---|---|
| 1988 | Olympic Games | Seoul, South Korea | 11th | 50 km |
| 1990 | European Championships | Split, Yugoslavia | 7th | 50 km |
| 1991 | World Championships | Tokyo, Japan | DNF | 50 km |
| 1993 | World Championships | Stuttgart, Germany | 13th | 50 km |
| 1994 | European Championships | Helsinki, Finland | 3rd | 50 km |
| 1995 | World Championships | Gothenburg, Sweden | 2nd | 50 km |
| 1999 | World Championships | Seville, Spain | DNF | 50 km |
External links
 | This biographical article relating to Italian athletics is a stub. You can help Wikipedia by expanding it. |