STP - Standard Temperature and Pressure
STP is commonly used to define standard conditions for temperature and pressure which is important for the measurements and documentation of chemical and physical processes:
Note! The earlier IUAPC definition of STP to 273.15 K and 1 atm (1.01325 10 5 Pa) is discontinued. However,
1 Pa = 10 -6 N/mm 2 = 10 -5 bar = 0.1020 kp/m 2 = 1.02x10 -4 m H 2 O = 9.869x10 -6 atm = 1.45x10 -4 psi (lbf/in 2 )
NTP is commonly used as a standard condition for testing and documentation of fan capacities:
A fan that produce a static pressure of 3 in H 2 O (a good average value) - will increase the absolute air pressure by
((3 in H 2 O) / (407 in H 2 O)) (100 %) = 0.74 %
SATP - Standard Ambient Temperature and Pressure is also used in chemistry (International Union of Pure and Applied Chemistry - IUPAC) as a reference:
ISA - International Standard Atmosphere is used as a reference to aircraft performance:
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