181) The ratio of the actual mass of water vapour in a unit mass of dry air to the mass of water vapour in the same mass of dry air when it is saturated at the same temperature and pressure, is called

182) For unsaturated air, the dew point temperature is __________ wet bulb temperature.

183) During dehumidification process, __________ remains constant.

184) The value of the wave length for maximum emissive power is given by

185) Emissivity of a body will be equal to its absorptivity at all temperatures.