The cooling in refrigerator is due to
- Reaction of the refrigerator gas
- Expansion of ice
- The expansion of the gas in the refrigerator
- The work of the compressor
The Correct Option is C
Solution and Explanation
This is based on Joule-Thomson effect. Refrigerators cool down their interiors by utilizing the expansion of a gas. The process starts with the compressor, which compresses the refrigerant vapor, raising its pressure, and then directs it into coils located on the refrigerator's exterior. As this hot gas comes into contact with the cooler kitchen air, it undergoes condensation. During this phase, the refrigerant absorbs heat from inside the fridge, effectively lowering the temperature and cooling the air within.
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Concepts Used:
Work Done Thermodynamics
In thermodynamics, work is a way of energy transfer from a system to surroundings, under the influence of external factors such gravity, electromagnetic forces, pressure/volume etc.
Energy (ΔU) can cross the boundary of a system in two forms -> Work (W) and Heat (q). Both work and heat refer to processes by which energy is transferred to or from a substance.
ΔU=W+q
Work done by a system is defined as the quantity of energy exchanged between a system and its surroundings. It is governed by external factors such as an external force, pressure or volume or change in temperature etc.
Work (W) in mechanics is displacement (d) against a resisting force (F).
Work has units of energy (Joule, J)