237) The average value of thermal conductivity for water at 20 Degree Centigrade saturate is about 0.51.

238) In aqua-ammonia absorption refrigeration system, incomplete rectification leads to accumulation of water in

239) The boiling point of ammonia is

240) The refrigerant used for absorption refrigerators working on heat from solar collectors is a mixture of water and

241) In a black body, all radiations are rejected.