What properties of gases are measurable?

We can measure following properties of gases:

1. mass m

2. volume V

3. pressure p

4. temperature T

Mass of gas can be written as a number of moles that 'form' this gas.

There are not only the physical properties of gases that can be measured, but

chemical properties as well. An example of this is the chemical composition

of the gas, which is determined by gas chromatography.