Product Description
Video and lesson investigations on the topic of the density of gases and liquids. Key concepts include:
- An ‘empty’ glass is not really empty, but is full of air.
- When an upturned glass is pushed into water the air is trapped in the glass. Water cannot enter because the space is occupied by air.
- Air is a mixture of gases that occupies space.
- Because it is a gas, air is less dense than liquid water.
- Therefore, when an ‘empty glass is inverted and placed in a tank of water, the less dense air in the glass ‘floats’ on top of the water inside the glass.
- This space filled with air prevents the water from getting to an object, such as a crumpled piece of kitchen roll, that has been pushed into the bottom of the glass.
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