Name: Thermos Flask: Construction and Working
Uploaded: 2019-07-19
Duration: 3 min 30 s
Description: The thermos flask is the most commonly used liquid container during the winter season. Watch the video to learn the principle based on which the thermos flas...

Question

Describe one experiment to show that liquids expand on heating.

Accepted Answer

(i) Take an empty bottle with a tight fitting cork having a hole drilled in its middle, a drinking straw, two bricks, a wire gauze and a burner.
(ii) Fill the bottle completely with water and add a few drops of ink in it to make it coloured.
(iii) Fix the cork in the mouth of the bottle and pass the drinking straw through the cork. Put some molten wax around the hole so as to avoid the leakage of water.
(iv) Pour some more water into the drinking straw so that water level in the straw can be seen. Mark the water level in the straw as shown in Figure.

(v) Place the bottle on the wire gauze kept over the two bricks as shown in Figure. Then heat the bottle by means of a burner.
(vi) Look at the level of water in the straw.
Observation: You will notice that as the water is heated more and more, the level of water in the drinking straw rises. This shows that water expands on heating.

Describe one experiment to show that liquids expand on heating.

Important Questions on Heat

Learn and Prepare for any exam you want !