Report Copyright Infringement View in OSM UK

Description

Find a way to show that hot air rises.

Resources

Two containers - one filled with hot tap water and the other with ice and cold water.
One balloon
One 1.25litre (or 2litre) plastic soft drink bottle. (The larger the bottle the more room the air has to push up and expand.)

**Please do not use boiling hot water for this activity. Hot water from the tap will effectively work for this activity.**

Instructions

During the following steps of the activity, provide children with the opportunity to predict, ask questions and discuss ideas.

1. Blow the balloon up to stretch it and help make it more flexible and let the air out.
2. Place the balloon over the mouth of the empty plastic bottle.
3. Stand the bottle in the center of the container filled with hot water. Wait a few minutes and notice the balloon start to inflate and expand.
4. Remove the bottle from the hot water and place it in the container with cold water and ice. Wait a few moments and notice that the balloon starts to deflate and contract.
5. Repeat step 3 and 4 again….it’s amazing!

Tags

(none)

Badge Links

• Scientist - Hot air