Multiple choice

At what temperature does water freeze?

  1. -2∘C

  2. 1∘C

  3. -1∘C

  4. 0∘C
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Pure water freezes into ice at 0 degrees Celsius (0 degrees C) under standard atmospheric pressure. This is also the temperature at which ice melts back into liquid water.

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