Question

If you heat up a closed tank of helium, what would happen to the pressure inside the tank?

Answer 1

If you heat up a closed tank of helium, the temperature of a gas at constant volume is increased,the pressure

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Answer 2

At these temperatures helium always will be a gas. When heated up, the pressure in the balloon rises, the balloon expands, and will reach to its original shape. The helium-filled balloon flies up in the air, because the average density of the balloon and helium together is lower than the density of air.