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What you should first understand is thermodynamics ... in the most simplistic terms ...

Pressure * Volume / Temperature is constant

so if the gas cools ... then Pressure1 * Volume1 / High Temperature is smaller than Pressure2 * Volume2 / Low Temperature

Let's firstly assume* that the pressure will be constant so Volume1/big number Volume2/smaller number => Volume 1 > Volume 2 ...hence the volume of gas when the temperature drops should be smaller.

*(though in reality pressure drops as you go higher in the atmosphere)

** To be realistic, the pressure outside the balloon will be smaller than the pressure when the balloon was at ground level, causing it to expand... to find out with a certain degree of certainty (the elasticity of the balloon is not really constant) how much "bigger" it will be, you need to also know the exterior pressure.

I would recommend learning more about thermodynamics as the law slightly differs with the type of transformation that occurs (adiabatic, isotropic etc )

Later Edit *** oh and I think its actually helium ... if you were referring to the fact that the gas should turn liquid because of the low temperatures then no ... helium and hydrogen boils at a very low temperature (below -200 Celsius).

/ btw sorry for any grammar mistakes, English is my second language.

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15y ago

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