Headspace or ullage, the unfilled space in a container
Headspace technology, the gaseous constituents of a closed space above liquids or solid emitting and vapors measured using headspace gas chromatography
Headspace (firearms) the distance measured from a closed chamber's breech face to the chamber feature that limits the insertion depth of a cartridge placed in it.
Companies and organizations
Headspace (company), an online healthcare company specializing in meditation
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