Question

explain how the liquid in a thermometer changes so that it can be used to measure a temperature

Answer 1

Answer:

actually it is dependent on thermometer type,the glass tube of the thermometer is filled with either alcohol or Mercury and when it gets hotter, the liquid get heated and expands and rise up taking up more space inside the tube. ... This rise and fall of the liquid , indicates the temperature.

Answer 2

Answer:

A thermometer has a glass tube sealed at both ends and is partly filled with a liquid like mercury or alcohol. As the temperature around the thermometer's bulb heats up, the liquid rises in the glass tube. ... When it is hot, the liquid inside the thermometer will expand and rise in the tube.