Dilation (chemistry)
Dilatation is a chemical term . It describes the change in volume of a body (based on its original volume) due to changes in temperature , pressure or other state variables . A dilatometer is used to measure the dilatation.
The change in volume occurs during phase changes (e.g. liquid → gaseous) with the increase in temperature, always abruptly. If the physical state of the body remains unchanged, the volume change usually takes place in smaller steps.
Dilatometry
Dilatometry is a method of thermal analysis and is used to measure the thermal expansion of materials (e.g. metals), glass appliances and building materials, etc. when the temperature increases.
reversal
The decrease in volume when the temperature drops is called contraction or compression.
medicine
Vasodilation (of lat. Vas , vascular 'and dilatatio ,' extension, dilatare , broad making ') referred to in medicine, the expansion of the blood vessels . This vasodilation is caused by drugs from the group of vasodilators (nitro compounds, calcium antagonists, etc.).
The opposite of vasodilation is vasoconstriction .
Individual evidence
- ^ Brockhaus ABC Chemie , VEB FA Brockhaus Verlag Leipzig 1965, p. 299.
- ↑ a b c Otto-Albrecht Neumüller (editor): Römpps Chemie Lexikon , Frank'sche Verlagshandlung, Stuttgart, 1983, 8th edition, p. 962, ISBN 3-440-04513-7 .
- ^ Siegfried Ebel and Hermann J. Roth (editors): Lexikon der Pharmazie , Georg Thieme Verlag, 1987, p. 669, ISBN 3-13-672201-9 .