#standard_atmosphere__atmosphere__atm__standardpressure  a unit of pressure: the pressure that will support a column of mercury 760 mm high at sea level and 0 degrees centigrade
  supertype:  pressure_unit  a unit measuring force per unit area
  subtype:  STP__s.t.p.  standard temperature and pressure

No statement uses or specializes standard_atmosphere; click here to add one.