According to Newton's law of cooling, the heat transfer from a hot body to a cold body is

In case of liquids and gases, the heat transfer takes place according to

The process of adding moisture to the air, without change in its dry bulb temperature, is known as humidification.

The condition of refrigerant after passing through the expansion or throttle valve, in a vapour compression system is

.A good refrigerant should have

The thermal diffusivity for gases is generally __________ those for liquids.

According to
Stefan-Boltzmann law, the total radiation from a black body per second
per unit area is directly proportional to the

 
According to
Prevost's theory of exchanges, every body irrespective of its
temperature continuously emit heat radiations to the surrounding bodies
and at the same time receives heat radiations from the surrounding
bodies.

If a gas is to be liquified, its temperature must be

 
The thermostatic expansion valve is used in __________ type of evaporators.