15) The process of heat transfer from a hot body to a cold body, in a straight line, without affecting the intervening medium, is called radiation.

16) The optimum effective temperature for human comfort is

17) The wet bulb temperature lines, on the psychrometric chart, are curved lines.

18) Thermal diffusivity is a

19) The condition of refrigerant after leaving the compressor and before entering the condenser is superheated vapour.