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). However, a common temperature and pressure in use by NIST for thermodynamic experiments is 298.15 K (25° C, 77° F) and 1 bar (14.5038 psi, 100 kPa). NIST also uses 15 °C (59 °F) for the temperature compensation of refined petroleum products, despite noting that these two values are not exactly consistent with each other.