How do you make air lighter(less dense) so that it will cause a balloon to rise?thanks

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Howdoyoumakeairlighter(lessdense)sothatitwillcauseaballoontorise?thanksHowdoyoumakeairlighter(lessde

How do you make air lighter(less dense) so that it will cause a balloon to rise?thanks
How do you make air lighter(less dense) so that it will cause a balloon to rise?
thanks

How do you make air lighter(less dense) so that it will cause a balloon to rise?thanks
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如何让气体更轻(密度更低)来让气球升起来呢?