s.t.p.

English Thesaurus

1. standard temperature and pressure (noun.quantity)

hypernym	:	atm, atmosphere, standard atmosphere, standard pressure,
definition	:	a unit of pressure: the pressure that will support a column of mercury 760 mm high at sea level and 0 degrees centigrade (noun.quantity)

hypernym	:	standard temperature,
definition	:	exactly zero degrees centigrade (noun.quantity)