The photo shows a hot air balloon - Junior Cycle Science - Question e - 2011
Question e
The photo shows a hot air balloon.
Why does the balloon rise when the air inside is heated?
Why? ______________________________________
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Worked Solution & Example Answer:The photo shows a hot air balloon - Junior Cycle Science - Question e - 2011
Step 1
Why does the balloon rise when the air inside is heated?
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Answer
When the air inside the balloon is heated, it expands. As the air expands, its density decreases because density is defined as mass per unit volume. The balloon's warm air becomes less dense compared to the colder air outside the balloon, causing it to float. The principle behind this is that an object will rise in a fluid (in this case, the surrounding air) if it is less dense than the fluid surrounding it.
Step 2
Why?
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Answer
The warmer air inside the balloon is less dense than the cooler air outside. Since less dense fluids rise through more dense fluids, the hot air balloon rises as the less dense air inside pushes against the denser, cooler air outside, allowing it to ascend.
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