Usually, in most substances the speed of light is slower than in empty space.
The empty space could be filled with liquid or solid matter.
empty space
The space in between gas molecules is not "just empty space." It is filled with constantly moving and colliding molecules. Gas molecules are in constant motion, so even though there may be more space between them compared to liquids or solids, the space is not truly empty.
This is a gas.
carbon dioxide gas
No, a tank of oxygen gas can only be partially emptied, not half empty. The tank will always have a mixture of gas and empty space.
Gas particles can be compressed into smaller spaces because they have a lot of empty space between them. When gas particles are compressed, their volume decreases due to the reduction in this empty space, resulting in an increase in pressure.
In a gas, the space between gas particles is largely empty. The particles are far apart compared to their size, with a lot of space between them. This allows gas particles to move freely and independently of one another.
If the space is in outer space there can be no gas against which a terminal velocity can occur
There is light in space but it primarily comes from stars, galaxies, and other celestial objects. The light can also be scattered by cosmic dust and gas. However, in the vast and empty regions of space, there is no atmosphere to scatter or reflect light, so it may appear dark or black to the human eye.
Space in the galaxy is primarily occupied by stars, gas, and dust. Stars, which emit light and heat, are the most prominent components, followed by interstellar gas and dust particles. These elements collectively make up about 99% of the space in a galaxy.
Gases