Which of the following statements is correct concerning the gas phase? a gas expands spontaneously to fill its container. depending on their chemical nature, two or more gases can form either a homogeneous or heterogeneous mixture. the volume of a gas is always less than the volume of its container. when pressure is applied to a gas, its volume increases.

A gas expands spontaneously to fill its container.

Explanation:

A gas would always expand spontaneously in any container to fill it up. Gas moves unaided to assume the volume of the space they are put into. Gas molecules are more random and posses more kinetic energy to drive their movements from one place to another. Gases would not require any energy input to make them move.

The volume of a container would then be the same as the volume of the gas that occupies it. Also, when pressure is applied to a gas, the volume reduces considerably according to "Boyle's law".

A homogeneous mixture would have their constituents existing in just one phase. Regardless of any chemical properties of gases, they form homogeneous mixtures.

this is poiselle's equation from fluid mechanic in physics. mech eng