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.
More Technology questions
- Why can Cloudflare's lava-lamp camera feed improve encryption even though the cryptographic software that consumes it is deterministic?
- If an attacker learns a pseudorandom generator's seed and algorithm after watching several outputs, why can the later outputs become reconstructable?
- If a phone game shuffle and a physical noise source both look messy, what makes only one useful for security against someone who knows the code?
- At parking-lot speed, why do quiet EVs need alert sounds before tire noise helps?
- Why does the Ferrari 296 cabin sound duct take sound before exhaust treatment?
- Why do sound engineers tune engine orders instead of just making a Ferrari-like exhaust louder?