Headspace
The vapour mixture trapped above a solid or liquid in a sealed vessel.
Health Advisory Level ...
Headspace: The empty volume in a container between the cap and the water level of the sample.
Headwaters: The source and upper part of a large stream or river, including the drainage basin.
ZEV- Zero Emissions Vehicle
ZHE- Zero Headspace Extractor
ZOI- Zone Of Incorporation
ZRL- Zero Risk Level ...
 See also: Hydrocarbon, Air, Hydrocarbons, Environment, Dissolved oxygen
  
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