Just like a balloon of Helium lifts about 1.02g for being less dense than the air. Does the same principle applies to vacuum being less dense than air? And if so, how much can a ballon (1L) of vacuum lift? Ignoring the condition that to have a pressure resistant balloon would make it heavier than the whole experiment.
[Physics] How much vacuum is needed to lift
buoyancydensityfluid-staticsliftvacuum
Best Answer
At 101.325 kPa (abs) and 15°C the density of air is 1.225 kg m$^{-3}$, so a balloon made of massless but very rigid material will lift 1.225 kg for each cubic meter of volume.