A refrigerator has certainly made our life a lot easier. Thanks to refrigerator we can now preserve food for days. The cold temperature inside the refrigerator slows down the bacterial growth in food and thus preserves the food for longer. But how exactly does the inside of the inside of the refrigerator remain cold?
A refrigerator is a machine that keeps food cool with some very clever science. All the time your refrigerator is humming away, liquids are turning into gases, water is turning into ice, and your food is staying deliciously fresh. Let’s take a closer look at how a refrigerator works!
The principle on how does a refrigerator work is pretty simple. Gases get hotter when you compress them into less volume because you have to work to push their energetic molecules together. When you expand a gas, it is suddenly able to occupy much more volume. The heat energy its molecules contain is now divided over a much bigger volume of space, so the temperature of the gas falls (it gets cooler).
The other principle at work in a refrigerator is that when you have two things that are different temperatures that touch or are near each other, the hotter surface cools and the colder surface warms up. This is a law of physics called the Second Law of Thermodynamics.