<Li> Since 1982, STP is defined as a temperature of 273.15 K (0 ° C, 32 ° F) and an absolute pressure of exactly 10 Pa (100 kPa, 1 bar). </Li> <P> STP should not be confused with the standard state commonly used in thermodynamic evaluations of the Gibbs energy of a reaction . </P> <P> NIST uses a temperature of 20 ° C (293.15 K, 68 ° F) and an absolute pressure of 1 atm (14.696 psi, 101.325 kPa). This standard is also called normal temperature and pressure (abbreviated as NTP). </P> <P> The International Standard Metric Conditions for natural gas and similar fluids are 288.15 K (15.00 ° C; 59.00 ° F) and 101.325 kPa . </P>

What is the temperature and pressure at ntp