Multiple choice

Why is mercury used in thermometers?

  1. Because it is a liquid

  2. Because it is a metal

  3. Because it expands uniformly

  4. Because it is light
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Mercury's key property for thermometer use is its uniform thermal expansion - it expands and contracts predictably with temperature changes. This makes it ideal for accurate measurement. Option C is correct. Being a liquid or metal alone (options A and B) isn't sufficient - many substances share those properties.

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