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why does a hot air balloon rise up in air?
The basis of how the balloon works is that warmer air rises in cooler air. This is because hot air is lighter than cool air as it has less mass per unit of volume. Mass can be defined by the measure of how much matter something contains. The actual balloon (called an envelope) has to be so large as it takes such a large amount of heated air to lift it off the ground.
To help keep the balloon in the air and rising, hot air needs to be propelled upwards into the envelope using the burner.A hot air balloon is made up of 3 main parts:

    The Envelope
    The actual fabric balloon which holds the air


    The Burner
    The unit which propels the heat up inside the envelope


    The Basket
    Where the passengers and pilot stand.


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