Question

Which gas law is applied in refrigerators?

Answer 1

Refrigerator

1. Refrigerators are heat engines that work in reverse. So that the heat that is produced inside the refrigerator is been transferred outside the machine.
2. A coolant is used to cool the refrigerator and a commonly used coolant is Freon.

Working of Refrigerator

1. The mechanism of the refrigerator is a cycle of expansion and compression that occur on Freon.
2. As the compressor does some work, the heat is transferred outside the refrigerator this is an exothermic process and during this gas gets converted into liquid.
3. For regeneration of gaseous Freon to a compressor, the coolant passes through the internal coil and does endothermic vaporization occurs where liquids are converted back into gaseous form.
4. During this endothermic process, Freon absorbs heat from the air inside the refrigerator and creates a cooling effect.

Law applied in Refrigerator

Gay Lussac's pressure law

1. This law states that when the volume is kept fixed the pressure of the gas is directly proportional to the absolute temperature of the gas.
2. It can be written as $\mathrm{P}\mathrm{\alpha }\mathrm{T}$ where P is pressure and T is the temperature of the gas.

Boyle's Pressure law

1. This law states that at a constant temperature volume of the gas is directly proportional to the pressure of the gas.
2. It can be written as $\mathrm{P}\mathrm{\alpha }\mathrm{V}$ where P is the pressure and V is the volume of the gas.

Charles temperature law

1. This law states that at constant pressure the volume of the gas is directly proportional to the temperature of the gas.
2. It can be written as $\mathrm{V}\mathrm{\alpha }\mathrm{T}$ where V is the volume and T is the temperature of the gas.

Thus, these laws are applied to the refrigerator.