The statement that gas has no specific volume is not entirely accurate. It's more accurate to say that gas has no fixed volume, but it does have a specific volume at a given temperature and pressure.

Here's a breakdown of why:

* Gases are compressible: Unlike solids and liquids, the molecules in a gas are far apart. This means that the distance between gas molecules can be easily reduced by applying pressure. Therefore, the volume of a gas can be changed by changing the pressure.

* Gases expand to fill their container: Gas molecules move randomly and are not fixed in any particular position. They will spread out to fill the entire volume of their container. This is why gases don't have a fixed volume.

So, while gas doesn't have a fixed volume like a solid or liquid, it does have a specific volume at a given temperature and pressure. This is described by the Ideal Gas Law, which states:

PV = nRT

Where:

* P is pressure

* V is volume

* n is the number of moles of gas

* R is the ideal gas constant

* T is temperature

This law shows that the volume of a gas is directly proportional to the temperature and inversely proportional to the pressure. Therefore, the volume of a gas can be calculated if you know the temperature, pressure, and amount of gas.

In summary, gases don't have a fixed volume because they are compressible and expand to fill their containers. However, they do have a specific volume that depends on the temperature and pressure.