The relevant, characteristic length dimensions of an object are usually named with dimensions .
Knowing the dimensions is particularly important in logistics and in the shipping industry in order to be able to plan and book the loading of railway wagons , containers , trucks and ships . The planning and handling of dimensions also play an important role in all engineering sciences , architecture , manufacturing technology and more.
- Cuboid body, technical dimensions (e.g. cabinet): width , height , depth
- Cuboid body, especially in packaging (e.g. box) length , width, height
- Roll-shaped body (e.g. tank): length, diameter
- Car: length, width, height, wheelbase , track width
- Tram , railway : gauge (rail)
- Ball bearings: inside diameter, outside diameter, width
- Screws: diameter, length, thread length; possibly: thread pitch
Planning and handling of dimensions
In manufacturing technology there is the sometimes trivial problem of which changes in dimensions are possible or to be expected. Trivial examples:
- A possibly irregularly shaped piece of raw material can be machined on a lathe ( lathe , lathe) to first produce a cylinder and then only a finished part with a smaller diameter and length .
- In a rolling mill , the length and width of a cuboid body can be increased at the expense of the thickness (height). The same applies to dough that is rolled out to cut biscuits.
- A less trivial example: disposable PET beverage bottles are only heated again shortly before filling to reduce transport costs and then inflated to their final dimensions.
Changes in dimensions are also not entirely unknown in the shipping industry. In the case of air freight , inflation of the transported goods or the packaging with reduced air pressure must be taken into account or avoided. A car standing on its own wheels bends in and out during transport and thus changes its height.
A fit clearance is necessary so that parts can be easily pushed inside one another . For a tight fit, roughness, elasticity, pressing in and expansion when heated are relevant.
Orders of magnitude
The dimensions of objects can be illustrated by comparing them with known objects. Some examples are given in the following table:
|Range in meters
|Diameter of a deoxyribonucleic acid molecule
or a - fullerene
|Thickness of gold leaf
size of viruses
|Baker's yeast - cell
|Diameter of the hair of a human head
Size of dust mites
|Radius of spaghetti
|Diameter of a euro cent - coin
|Diameter of a cultivated apple
|Height of a limousine
|Height of a single-family house
|Length of a soccer field
|Length of a runway
|Diameter of a middle town
height of Mount Everest
|Upper limit of the mesosphere
|Radius of the moon
|Diameter of the earth
|Diameter of the sun
Diameter of the lunar orbit
Three light seconds
|Half a minute of light
|Radius of the earth's orbit
|Size of the solar system
|Radius of the local interstellar cloud
|Thickness of the Milky Way system
|Diameter of the Milky Way System
|Diameter of galaxy clusters
|Radius of the Virgo supercluster
|Diameter of the great wall
|Diameter of the observable universe