STP - Standard Temperature and Pressure & NTP - Normal Temperature and Pressure

The definition of STP - Standard Temperature and Pressure and NTP - Normal Temperature and Pressure

Since temperature and air pressure may vary form site to site it is necessary with standard reference conditions for testing and documentation of chemical and physical processes.

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.

• STP - Standard Temperature and Pressure - is defined as air at 0^oC (273.15 K, 32^oF) and 1 atm (101.325 kN/m², 101.325 kPa, 14.7 psia, 0 psig, 29.92 in Hg, 760 torr, 33.95 Ft.H₂O, 407.2 In.W.G, 2116.8 Lbs./Sq.Ft.)

NTP - Normal Temperature and Pressure

NTP is common for testing and documentation of fan capacities.

• NTP - Normal Temperature and Pressure - is defined as air at 20^oC (293.15 K, 68^oF) and 1 atm ( 101.325 kN/m², 101.325 kPa, 14.7 psia, 0 psig, 29.92 in Hg, 760 torr). Density 1.204 kg/m³ (0.075 pounds per cubic foot)

SATP - Standard Ambient Temperature and Pressure

SATP - Standard Ambient Temperature and Pressure is also used in chemistry as a reference with temperature of 25 degC (298.15 K) and pressure of 101 kPa.

ISA - International Standard Atmosphere

ISA - International Standard Atmosphere is used as a reference to aircraft performance and is defined to 101.325 kPa, 15 degC and 0% humidity.

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