What simple machine is used in a fridge?

A fridge primarily uses a refrigeration cycle, which involves a compressor, evaporator, and condenser—these components can be considered simple machines. The compressor is a type of pump that compresses refrigerant gas, while the condenser and evaporator facilitate heat exchange, moving heat out of the fridge. Additionally, the door of the fridge operates like a lever, allowing easy opening and closing. Overall, these elements work together to maintain the cool temperature inside the refrigerator.