#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"
  supertype:  physical_phenomenon  a natural phenomenon involving the physics of matter and energy
  subtype:  blood_pressure__bloodpressure  the pressure of the circulating blood against the walls of the blood vessels; results from the systole of the left ventricle of the heart; sometimes measured for a quick evaluation of a person's health; "adult blood pressure is considered normal at 120/80 where the first number is the systolic pressure and the second is the diastolic pressure"
     subtype:  systolic_pressure  the blood pressure (as measured by a sphygmomanometer) during the contraction of the left ventricle of the heart
     subtype:  diastolic_pressure__diastolicpressure  the blood pressure (as measured by a sphygmomanometer) after the contraction of the heart while the chambers of the heart refill with blood
     subtype:  arterial_pressure  the pressure of the circulating blood on the arteries; "arterial pressure is the product of cardiac output and vascular resistance"
     subtype:  venous_pressure  the pressure exerted on the walls of the veins by the circulating blood
  subtype:  gas_pressure__gaspressure  the pressure exerted by a gas
     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
  subtype:  head.pressure_level  the pressure exerted by a fluid; "a head of steam"
  subtype:  hydrostatic_head__hydrostatichead  the pressure at a given point in a liquid measured in terms of the vertical height of a column of the liquid needed to produce the same pressure
  subtype:  intraocular_pressure__intraocularpressure  pressure inside the eyeball;regulated by resistance to the outward flow of aqueous humor; "glaucoma results from increased intraocular pressure"
  subtype:  oil_pressure__oilpressure  pressure that keeps oil on the moving parts of an internal-combustion engine
  subtype:  osmotic_pressure__osmoticpressure  (physical chemistry) the pressure exerted by a solution necessary to prevent osmosis into that solution when it is separated from the pure solvent by a semipermeable membrane
  subtype:  corpuscular-radiation_pressure__corpuscularradiationpressure__radiation_pressure__radiationpressure  the minute pressure exerted on a surface normal to the direction of propagation of a wave
     subtype:  acoustic_radiation_pressure  (acoustics) the pressure exerted on a surface normal to the direction of propagation of a sound wave
  subtype:  instantaneous_sound_pressure__instantaneoussoundpressure__sound_pressure__soundpressure  the difference between the instantaneous pressure at a point in a sound field and the average pressure at that point
  subtype:  suction  a force over an area produced by a pressure difference
  subtype:  vapor_pressure__vaporpressure__vapour_pressure  the pressure exerted by a vapor; often understood to mean saturated vapor pressure (the vapor pressure of a vapor in contact with its liquid form)

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