This term has a lot of meanings dependent on the sphere of use. In the whole it is essentially a peculiar system of coordinates, consisting of three dimensions. It can be either absolutely theoretic (for exmple personal space), or it can be entirely material (the house).
The Space can be either drawn schematically in geometry or in physics as well as can realistically depicted in art.
The Space can either have limits (clear or fuzzy limits), or it can seem unlimited like the Universe.
The Size is a scale of some event, quantity or dimensions of an object (length, width, heigth, diameter).
Everything in the world from a sheet to needle's eye needs measuring. It is necessary for a product's meeting standards or components' proper fitting. That's why the term "size" often walks arm-in-arm with such a term as "accuracy". As they say "measure twice, cut once".
The measure is dimension, the scale of something
The degree of closeness or remoteness between the objects. From one spot to another.
Today's means of transportation drastically diminished the impact of such a factor as the Distance.
Remember Jules Verne's novel "Around the World in Eighty Days". It is now we can fly around the whole world in a day or two. In the times of Phileas Fogg it was something unimaginable.
Here really comes the time to speak about nanotechnology. Something like this was described by Russian novelist Nikolai Semyonovich Leskov in his story "The Lefthander".
Nowadays it is not an oddity, but the hole industry, put to service. Though it keeps surprising us with accuracy and sizes of components and objects.
Imagine a gear which has the same size as the pits of a compact disc.
There are things which are too small to measure them even by millimetres. For example the diameter of a red blood cell is as much as 7 m, the average diameter of a human hair is 40 m.
One can measure in microns dust particles and waves.
Millimeter is a measure of length. In military slang it is called Mike-Mike. It seems to be very small scale, yet to large to belong to the microworld. Especially if to take into account
that a millimeter amounts to 1000000 bicrons.
For someone the whole world can be put in such a tiny space.
In the cartoon "Horton Hears a Who!" it is described how such a world dwelled on a speck.
If you need to measure out 10 mm, but there is no ruler, just put your thumb at the surface measured. This is just what you need, though there can be come inaccuracy, yet better than nothing.
Metre has a strong connection with such a dimension as a second. In combination with it we can measure the speed. The light in vacuum can pass 299,792,458 metress in one second.
It is also well known that there is such an artifact as standard of meter which had been in usage from 1889 to 1960.
This measure is rather wide-spread in the world, though not everywhere. In some countries people use miles, therefore the one, who is used to a metric system, feels some kind of discomfort while being there.
For example, kilometer is almost the width of the Central Park in Ne York (849 metres).
The distance between Merican and Canadian sides of Niagara Falls is 1039 meters.
Parsec or a parallax of one second is a too large-scale measure to be used on the Earth.
Parsec measures the distance between the objects in Space, which are very much remoted from each other.
(if to speak of the stas or other galaxies, or even clusters).
- Diameter of the Milky Way is about 30 kpc;
- The distance to Andromeda is about 0,77 Mpc;
- The closest large cluster, the Virgo Cluster is located at the distance of 18 Mpc;
- The distance to the horizon of the visible prt of the Universe is about 4 Gpc (the distance, passed by the light, sent from the Earth);
- 10 pc is the distance the Light passes in 32 years, 7 months and 6 days. 1 pc in 3,26 years (for example the light travels from the Sun to the Earth during 8,31 minutes).
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