Question

difference between STP and NTP

Answer 1

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.

What is the difference between STP and NTP? - Quora

Answer 2

Stp-standerd temp and pressure and ntp-normal temp and pressure.