Product Description
Video and lesson investigations on the topic of heating air and gases. Key concepts include:
- Hot air expands and rises.
- A captured ‘parcel’ of hot air can be made to lift objects off the ground.
- A hot air balloon will stay afloat as long as the air inside it is hotter than the air around it.
- An air heater is needed to make and keep the air inside a hot air balloon warmer than the air outside it.
- Hot air balloons use the process of ‘convection’ to get them airborne.
- When air gets heated, the gases expand and the balloon rises.
- This is because the gas molecules in the air, which collide with each other all the time, collide much more when they are heated.
- The more they collide, the farther apart they move from each other. This motion is called gas expansion.
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