subatmospheric

/ˌsʌbætməsˈfɛrɪk/
adjective
  1. Having a pressure lower than the normal atmospheric pressure at sea level.
    • The pump maintains subatmospheric conditions in the laboratory experiment.
    • The vacuum chamber creates a subatmospheric environment for testing spacecraft components.
    • Subatmospheric pressure inside the container helps preserve the food by removing air.
Synonyms
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