262) When a perfect gas is expanded through an aperture of minute dimensions, the process is known as

263) Steam coal is a

264) The kinetic energy per kg molecule of any gas at absolute temperature T is equal to (where R_u = Universal gas constant)

265) The atomic mass of nitrogen is __________ oxygen.

266) One kg of sulphur requires 1 kg of oxygen for complete combustion and produces 2 kg of sulphur dioxide.