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Here are the densities at STP:

Air (ρair) = 1.292 kg/m3.

Helium (ρHe) = 0.178 kg/m3

so you'd need to compress Helium about 7x to achieve the same density as air.

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Helium loses its buoyancy when it reaches a compression ratio that increases its density to be equal to or greater than the density of air. This usually occurs at a compression ratio of around 1.7 to 2.0 times the original volume.

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Q: What compression ratio does helium need to loose its bouyancy?
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