NTP

abbreviation for
  1. normal temperature and pressure: standard conditions of 0°C temperature and 101.325 kPa (760 mmHg) pressureAlso: STP
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012