The Hotness or Coldness of a substance is called it's temperature and is measured with a thermometer. The bulb is filled with liquid, usually mercury, but also alcohol when very low temperatures need to be measured, which expands when the temperature rises and contacts when the temperature falls.
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Answer:
The Hotness or Coldness of a substance is called it's temperature and is measured with a thermometer. The bulb is filled with liquid, usually mercury, but also alcohol when very low temperatures need to be measured, which expands when the temperature rises and contacts when the temperature falls.