#gas_pressure__gaspressure  the pressure exerted by a gas
  supertype:  #pressure_level__pressure__force_per_unit_area  the force applied to a unit area of surface; measured in pascals (SI unit) or in dynes (cgs unit); "the compressed gas exerts an increased pressure"
  subtype:  #atmospheric_pressure__atmosphericpressure__air_pressure__airpressure  the pressure exerted by the atmosphere
     subtype:  #compartment_pressure__compartmentpressure  the air pressure maintained in the air-tight compartment of an aircraft
     subtype:  #barometric_pressure  atmospheric pressure as indicated by a barometer

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