Physics KS3 / GCSE: What does gas weigh?

Dr Kevin Fong uses the reaction of citric acid and bicarbonate of soda to produce carbon dioxide gas, and explains how gasses are affected by gravity.

This clip is from the Royal Institution Christmas Lectures 2015.

Teacher Notes

After watching the clip, you could ask students to research the density of different gases and compare them to the density of the atmosphere at sea level.

Ask them to predict what would happen to a balloon filled with each of these gases.

Searching online will allow you to find clips of model boats made from aluminium foil floating in a tank full of sulfur hexafluoride.

Curriculum Notes

This clip will be relevant for teaching KS3 and GCSE Physics.

This topic appears in OCR, Edexcel, AQA, WJEC KS4/GCSE in England and Wales, CCEA GCSE in Northern Ireland and SQA National 4/5 in Scotland.

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