* Physics: Refrigerators use the principles of thermodynamics to move heat from inside the fridge to the outside. This involves the use of refrigerants that change state (liquid to gas) and absorb heat in the process.
* Engineering: The design and construction of a fridge involves mechanical engineering (compressing the refrigerant), electrical engineering (controlling the motor and temperature), and chemical engineering (selecting the appropriate refrigerant).
* Materials science: The fridge's materials, from the insulation to the cooling coils, are selected based on their thermal properties and durability.
So, while not a single branch of science, the fridge is a product of several scientific disciplines working together.
