subatmospheric
adjective
sub·at·mo·spher·ic
ˌsəb-ˌat-mə-ˈsfir-ik 
-ˈsfer-
: less or lower than that of the atmosphere
subatmospheric pressure
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“Subatmospheric.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/subatmospheric. Accessed 4 Jul. 2025.
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subatmospheric
adjective
sub·at·mo·spher·ic
ˌsəb-ˌat-mə-ˈsfir-ik, -ˈsfer-
: less or lower than that of the atmosphere
subatmospheric pressure
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