A refrigerator does not create cold so much as move heat. Inside the system, a refrigerant evaporates and condenses in a controlled cycle, absorbing heat from the interior and releasing it outside. That is why the back of a refrigerator often feels warm.
This heat-pump principle is one of the most useful ideas in modern life. It preserves food, supports medicine storage, and powers air conditioning and heat pumps. Behind the everyday hum of a fridge is a beautifully practical thermodynamic trick.
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