Wiktionary
standard temperature and pressure
n. (context physics chemistry English) The international, standard conditions used to aid reproducibility; a temperature of 0 °C (273.15 K) and a pressure of 1 atmosphere (101.325 kPa). Abbreviated as STP.
Usage examples of "standard temperature and pressure".
The creature's remains were static in the without according to accepted definition number three to within approximately the speed of slow breath at standard temperature and pressure.