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We have been designing and making our own hot air balloons. We used plastic bags for the envelop and we made baskets to carry passengers. Can you remember what made the balloons float? What could we do to improve our designs?

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We have been designing and making our own hot air balloons. We used plastic bags for the envelop and we made baskets to carry passengers. Can you remember what made the balloons float? What could we do to improve our designs?
I’m going to bering my paper hot air balloon to school:
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Jack
To make the balloon stay in the air longer we tried using a candle in our basket but ours didn’t go very far as our wires burnt and broke
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Mrs Harrison
Maybe you needed wire to attach the basket Jack. I’m impressed with your candle idea though.