Thermodynamics Ideal Gases/Perfect Gases a Gases. Agas is a fluid which has no intrinsic shape, e and which expands indefinitely to fill any container ● in which it is held. Ideal gases 1. The amount of substance of which it is comprised, n(mole 2. The temperature of the gas, T (Kelvin) 3. The pressure of the gas, P(Pascal) 4. The volume occupied by the gas,Ideal Gases/Perfect Gases Gases: A gas is a fluid which has no intrinsic shape, and which expands indefinitely to fill any container in which it is held. Ideal Gases: 1. The amount of substance of which it is comprised, n (mole) 2. The temperature of the gas, T (Kelvin) 3. The pressure of the gas, P (Pascal) 4. The volume occupied by the gas, V (m3 ) Thermodynamics