Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. In physical sciences, standard conditions for temperature and pressure are standard sets of conditions for experimental measurements, to allow comparisons to be made between different sets of data. The most used standards are those of the International Union of Pure and Applied Chemistry and the National Institute of Standards and Technology but are far from being universally accepted standards. Other organizations have established a variety of alternative definitions for their standard reference conditions. The current version of IUPAC's standard is a temperature of 0 °C and an absolute pressure of 100 kPa, while NIST's version is a temperature of 20 °C and an absolute pressure of 101.325 kPa.
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