It is difficult to measure the volume of a gas because: gases have no volume. gases are not soluble in liquids. the volume of a gas depends on the container. all of the above.

The volume of a gas depends on the container.

Explanation:

In the gaseous state of matter, the molecules are present in irregular pattern. The molecules are not closely packed and they can move freely from one place to another and have high kinetic energy.

The molecules have weakest intermolecular forces of attraction and thus do not possess any definite shape and no definite volume.

They occupy the whole volume of the container due to their free movement.

For example : Helium gas

particle   p is an electron and particle q is a neutron