The relationship between temperature, pressure, density and volume of gas?

The relationship between temperature, pressure, density and volume of gas?

PV = NRT - overview the Clapeyron equation is usually expressed as follows: PV = NRT ① P is the pressure, V is the volume of gas, n is the amount of material, t is the absolute temperature, R is the gas constant. All gases have the same r value. If the pressure, temperature and volume are in Si, r = 8.314 PA · m3 / mol