Question

In Galileo's thermometer, the expansion of _____ is used to measure the temperature.

Answer 1

Galileo's thermometer:

1. Galileo's thermometer was invented by Galileo.
2. Galileo was the first scientist to construct a thermometer based on the thermal expansion.
3. Galileo's thermometer was crude instrument which could not be used to measure the temperature accurately.
4. Galileo's thermometer was based on expansion of gas.

Hence, in Galileo's thermometer, the expansion of gas is used to measure the temperature.