perfect vacuum
Purely imaginary. There is no such location; it cannot have a name.
matter
matter
space, time, and all the matter is in the universe.
Probably the best term to encompass all of those would be "the universe".
the universe
The amount of matter an object contains depends on its mass and density. Objects in space can vary greatly in size and composition, so their matter content will also vary.
It has mass and required space to contain its' existence.
Matter
Matter takes up space. It has volume, which is the amount of space it occupies. When matter interacts with other matter, it can also take up time and energy.
A vacuum does not contain matter, such as air or particles. It is a space with very low pressure, where there is little to no presence of gas molecules.
Matter is the basis for everything. Anything that exists has matter. Dark matter are anomalies that cannot account for "missing matter". Matter does not contain the solar energy and radio signals that travel through "empty space".
Energy (such as light) and space (which may contain matter, but is not made out of it).
That's why it's called space, because there is so little matter in it.
Density is the amount of matter in a given space.
Matter is anything that has mass and volume, making up the physical substance of the universe. It consists of atoms and molecules that are constantly in motion, interacting with each other through fundamental forces. All the objects we see and interact with are made of matter.
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