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Refrigerators

Refrigerators employ evaporation in order to absorb heat and create a cold environment in which to store food.  Cold temperatures stall the progress of bacteria, allowing us to keep our food safe to eat and fresh. 

A refrigerant is the liquid used to create this cold environment.  Because it evaporates at low temperatures, it creates colder temperatures.  Liquid refrigerant is placed in coils in a refrigerator and is moved from a high pressure state to a low pressure state.  In doing so, it expands and evaporates, thereby absorbing heat. 

Coils inside the refrigerator allow for this heat absorption.  Next, the gas passes through a compressor, raising the refrigerant’s temperature.  The heat is dissipated through heat-exchange coils, located outside of the refrigerator.  Cooling, the refrigerant returns to its liquid form, and the cycle begins once more.  In this way the refrigerant flows through the refrigerator continuously, keeping the fridge, and what’s in it, cool.