Physics
Answer
The following experiment demonstrates that air expands on heating:
- Take an empty bottle. The empty bottle contains air.
- Attach a rubber balloon to its neck as shown in figure.
- The balloon is deflated initially.
- Place the bottle in a water bath containing boiling water. It heats the air present in bottle.
- After sometime it is noticed that the balloon gets inflated as shown in figure.
Conclusion — This shows that on heating, air present inside bottle expands and fills the balloon. So the balloon gets inflated. This shows that air expands on heating.
Related Questions
An empty glass bottle is fitted with a narrow tube at its mouth. The open end of the tube is kept in a beaker containing water. When the bottle is heated, bubbles of air are seen escaping into water. Explain the reason.
Which of the following will expand more, when heated to the same temperature:
(a) solid,
(b) liquid or
(c) gas?
Describe an experiment to show that liquids expand on heating.
State one application of thermal expansion of liquids.