The Refrigerator
⭐ MasteredFridges keep food cold to slow bacteria growth so it stays fresh longer. Before fridges people used ice blocks and salting to preserve food.
Freezers keep food at about -18°C.
All about The Refrigerator
A refrigerator keeps food cold, which slows the growth of bacteria and keeps food fresh for longer. Fridges use a refrigerant that absorbs heat from inside the cabinet and releases it outside, using a cycle of compression and expansion.
Before fridges, people kept food cool in ice houses and cellars, or preserved it by salting, drying, smoking and pickling. Commercial refrigeration in the 1800s and 1900s changed food supply, making it possible to transport fresh food over long distances.
🎮 Try it yourself!
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Real-life uses of The Refrigerator
- Keeping milk and vegetables fresh
- Storing leftovers safely
- Making ice cubes for drinks
Frequently asked questions about The Refrigerator
What temperature should a fridge be?
Most fridges should be kept at or below 5°C to keep food safe.
Why does a fridge hum?
The compressor and fan run to move heat out of the fridge, which causes a gentle hum.
Does cold food stop germs?
It slows germs down rather than killing them, so food still needs to be stored and used correctly.