State one application of thermal expansion of liquids.
Name the instrument used to measure the temperature of a body.
Write true or false for a given statement.
Kerosene contracts on heating.
Why do telephone wires sag in summer ?
Fill in the blank
The temperature of boiling water is _______
Why are gaps left between successive rails on a railway track ?
Describe an experiment to show that air expands on heating.
Telephone wires are kept tight between the two poles in summer.