Before expansion valve

In evaporator

Between evaporator and condenser

Between compressor and condenser

After passing through the expansion valv

After passing through the condenser

Before passing through the condenser

Before entering through the compressor

sum of the partial pressures of all divided by average molecular weight

sum of the partial pressure of all

greater of the partial pressure of all

average of the partial pressure of all

to produce cooling effect

to control the temperature refrigerated space

to convert refrigerant from liquid to vapour state

to control the flow of refrigerant

it has low latent heat

it is non-toxic

it is relatively cheap

it has low working pressure