43) An isothermal process is governed by

44) The sum of internal energy (U) and the product of pressure and volume (p.v) is known as

45) The value of 1 mm of Hg is equal to

46) One kg of carbon requires 4/3 kg of oxygen and produces __________ kg of carbon monoxide gas.

47) The behaviour of a perfect gas, undergoing any change in the variables which control physical properties, is governed by