93) According to Stefan's law, the total radiation from a black body per second per unit area is directly proportional to the fourth power of the absolute temperature.

94) In electrolux refrigerator

95) Two long parallel surfaces each of emissivity 0.7 are maintained at different temperatures and accordingly have radiation heat exchange between them. It is desired to reduce 75% of the radiant heat transfer by inserting thin parallel shields of emissivity

96) A boot-strap air cooling system has

97) The boiling point of __________ is -10.5 Degree Centigrade.