
1) Ammunition 2) Heavy metal supergroup 3) Indefinite quantity
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https://www.crosswordclues.com/clue/headspace

1) Mentality
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The distance measured from the part of the chamber that stops forward motion of the cartridge (the datum reference) to the face of the bolt. Used as a verb, headspace refers to the interference created between this part of the chamber and the feature of the cartridge that achieves the correct positioning.[21]
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http://en.wikipedia.org/wiki/Glossary_of_firearms_terms
[firearms] In firearms, headspace is the distance measured from the part of the chamber that stops forward motion of the cartridge (the datum reference) to the face of the bolt. Used as a verb, headspace refers to the interference created between this part of the chamber and the feature of the cartridge that achieves the correct positioning...
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http://en.wikipedia.org/wiki/Headspace_(firearms)
[organisation] headspace is a youth mental health initiative established by the Australian government in 2006. The project is funded by the Department of Health and Ageing under the Youth Mental Health Initiative Program. headspace offers support for those aged 12 to 25 years old on a range of issues including depression, anxiety, stress, a...
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http://en.wikipedia.org/wiki/Headspace_(organisation)

The vapor mixture trapped above a solid or liquid in a sealed vessel.
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http://www.encyclo.co.uk/visitor-contributions.php

[
n] - the volume left at the top of a filled container (bottle or jar or tin) before sealing
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http://www.webdictionary.co.uk/definition.php?query=headspace

The vapor mixture trapped above a solid or liquid in a sealed vessel.
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https://www.encyclo.co.uk/local/20094

The area at the top of a vessel (fermenter, bottle, or keg) which does not contain any liquid. In general, the goal is to minimize headspace, to prevent oxidation of the beer by oxygen in the air. Headspace in the primary fermenter is not a serious concern, because the CO2 produced by fermentation forms a protective blanket on top of the beer, an...
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https://www.encyclo.co.uk/local/22622
No exact match found.