A balloon with a vacuum inside cannot achieve buoyancy because the structure needed to resist air pressure outweighs the displaced air.

Is it true that a balloon with a vacuum inside cannot achieve buoyancy because the structure needed to resist air pressure outweighs the displaced air?

Partly. One source notes that a balloon structure must be tough enough to withstand the pressure difference across it, and an 1888 newspaper item describes a proposed steel vacuum balloon whose feasibility a physicist was asked to assess, but neither computes whether the structure would outweigh the displaced air. A helium-balloon experiment shows lift is computed from gas density and Archimedes' principle, which bears on buoyancy generally but not on the vacuum case.

Verdict: CONTESTED PARTIAL · 2 sources for, 1 against · Last checked 3 Oct 2026

The private library was unavailable for some searches in this check. Missing library results are not evidence against the claim.

A simple method for environmental cell depressurization for use with an electron microscope. (n.d.). cir.nii.ac.jp. https://doi.org/10.1093/jmicro/dfx029

Jack, B., Rafaela, B., & Katherine, K. (2013). Accurate Determination of the Volume of an Irregular Helium Balloon. eric.ed.gov. https://doi.org/10.1119/1.4775529

A Steel Balloon. (Auckland Star, 25 August 1888). (1888). paperspast.natlib.govt.nz. https://paperspast.natlib.govt.nz/newspapers/AS18880825.2.47.31