How Does a Fridge Keep Food Cold?

A fridge keeps food cold by moving heat out of the inside and into the room. Like when you blow on your hot soup, you cool it down because the air takes some of its warmth away. A fridge works like that but with special chemicals called refrigerants, which do the job even better. Inside the fridge, a liquid turns to gas (which makes it cold), and then back to liquid again (which warms up the room slightly). It keeps going around and around until everything inside stays cool.