tell the defference between STP and NTP
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STP is set by the IUPAC as 0°C and 100 kPa or 1 bar. Many old books and online sources say that standard pressure is 101.325 kPa (the old IUPAC standard that was changed in 1982), but I defer to the current IUPAC standard of 100 kPa. NTP is set at 101.325 kPa but uses 20°C as the temperature.
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