Question

Describe an experiment to show than living things produce heat

Answer 1

To show - Liquids expand on heating

Experiment - Take a round bottom flask and fill it with water. Close its mouth with a cork having a delivery tube and mark the level of water as A.

Now heat the flask, we see that the level of water in the tube rises from A to a higher mark B.

Observation - This shows that liquids expand on heating.