207) The humidification process, on the psychrometric chart is shown by

208) The colour of the flame of halide torch, in case of leakage of freon refrigerant, will change to

209) The wet bulb depression indicates __________ humidity of the air.

210) The refrigerant widely used in domestic refrigerators is

211) When absorptivity (?) = 1, reflectivity (?) = 0 and transmittivity (?) = 0, then the body is said to be a