Standard Conditions are the condition specified in a series of scientific tests for experimental measurements to allow comparisons between different sets of data;
IUPAC: a) Standard Temperature and Pressure (STP): Standard Conditions for Gases – Temperature, 273.15 °K (0 °C) and pressure of 10^5 pascals (100 kPa, 1 bar); b) Standard Ambient Temperature and Pressure (SATP) as a temperature of 298.15 °K (25 °C, 77 °F) and an absolute pressure of exactly 100 kPa (1 bar).
NIST: Normal Temperature and Pressure (NTP): uses a temperature of 20 °C (293.15 °K, 68 °F) and an absolute pressure of 101.325 kPa (14.696 psi, 1 atm).
The International Standard (SI) Metric: Conditions for natural gas and similar fluids are 288.15 °K (59.00 °F, 15.00 °C) and 101.325 kPa.
Related Definitions in the Project: The Engineering; Property and Unit
