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It's a good question, I don't know how to calculate the answer.
Hi geezerI have the mathematical skills of a red cabbage.PS from Red Cabbage: The chemical energy of the propane remains roughly the same in both cool and warm air. That energy is used to overcome the 'heat energy' of the surrounding air. Cool weather might be doing the balloonist a favor by reducing the heat energy of the surrounding air. If that is the case - and insulating capacity of the balloon material remains the same - then less heat energy might be needed to create the differential?Of course my next scientific breakthrough is to simply ask a hot air balloonist. But how much fun would THAT be!
HOW MUCH CAN A BALLOON LIFT? It depends on how cold the air is and the size of the balloon. Balloons lift better in cold air than in warm air. The larger the air volume of the balloon, the more it can lift.