# Estimate the volume of a hydrogen filled balloon that can lift 24 kg load in air?

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Estimate the volume of a hydrogen filled balloon that can lift 24 kg load in air?
posted May 8

Air density = about 1.2 kg/m3.
Air molar mass = about 29,
Hydrogen molar mass = 2,
Hydrogen density is 2/29 *1.2 kg/m3 = ~0.1 kg/m3
The difference is about 1.1 kg/m3. Knock off a little for the mass of the envelope and rigging lines and it is down to 1 kg per m3.
24 m3 is approximate volume required to lift 24 kg load.

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