alveolar gas equation

The state of a given mass of gas is determined by three parameters namely, pressure, volume and temperature. When a gas is heated both its pressure and volume undergo a change. Thus a gas has two different coefficients of expansion.Volume coefficient" the coefficient of expansion of a gas at constant pressure.Pressure coefficient" coefficient of expansion of a gas at constant volume.The volume coefficient of a gas is defined as the ratio of increase in volume of a given mass of gas per degree rise of temperature to its volume at 0°C when pressure is kept constant. It is denoted by a. If VQ and V be the volumes of a given mass of gas at 0°C and t°C respectively and at the same pressure thenIf Vj and V2 be the volumes of a given mass of gas at C and t2 C respectively pressure remaining constant then using equation (2) it can be proved thatThe pressure coefficient of a gas is defined as the ratio of increase in pressure of a given mass of gas per degree rise of temperature to its pressure at 0°C when volume is kept constant. It is denoted by (3.