Why do refrigerators keep food cold?
Show answer & explanation
Answer: Gas absorbs heat when expanding
Gas absorbs heat when expanding ✓ — Correct! Refrigerators use a cycle: liquid refrigerant evaporates inside (absorbing heat from food), then gets compressed back to liquid outside (releasing heat). The expanding gas absorbs warmth, and the cycle repeats. It moves heat out, not cold in!
Ice blocks stored inside — Wrong. Modern refrigerators don't use ice. They use compressor and refrigerant systems.
Electricity makes air cold — Wrong. Electricity powers the compressor, but the cooling comes from refrigerant phase changes, not direct electrical cooling.