What is the principle behind a thermometer?
Correct Answer: Thermometers work on the principle of expansion of liquid (like mercury) with temperature.
- Step 1: Understand that a thermometer measures temperature.
- Step 2: Know that temperature is related to how fast particles move in a substance.
- Step 3: Learn that when a liquid (like mercury) gets warmer, it expands and takes up more space.
- Step 4: Realize that the thermometer has a scale that shows the temperature based on how much the liquid expands.
- Step 5: Remember that when the temperature goes down, the liquid contracts and takes up less space.
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