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  2. STP - Standard Temperature and Pressure - The Engineering ToolBox

    www.engineeringtoolbox.com/stp-standard-ntp...

    NTP is commonly used as a standard condition 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, 407 in H2O, 760 torr).

  3. U.S. Standard Atmosphere vs. Altitude - The Engineering ToolBox

    www.engineeringtoolbox.com/standard-atmosphere-d...

    The "U.S. Standard Atmosphere 1976" is an atmospheric model of how the pressure, temperature, density, and viscosity of the Earth's atmosphere changes with altitude. It is defined as having a temperature of 288.15 K (15 o C, 59 o F) at the sea level 0 km geometrical height and 101325 Pa (1013.25 hPa, 1013.25 mbar, 760 mm Hg, 29.92 in Hg) .

  4. International Standard Atmosphere - Wikipedia

    en.wikipedia.org/wiki/International_Standard...

    The International Standard Atmosphere (ISA) is a static atmospheric model of how the pressure, temperature, density, and viscosity of the Earth's atmosphere change over a wide range of altitudes or elevations. It has been established to provide a common reference for temperature and pressure and consists of tables of values at various altitudes ...

  5. Standard temperature and pressure - Wikipedia

    en.wikipedia.org/wiki/Standard_temperature_and...

    Standard temperature and pressure (STP) or standard conditions for temperature and pressure are various standard sets of conditions for experimental measurements used to allow comparisons to be made between different sets of data.

  6. International Standard Atmosphere - The Engineering ToolBox

    www.engineeringtoolbox.com/international...

    International standard atmosphere in elevation -2000 to 30000 metre - pressure, temperature, density, viscosity, thermal conductivity and velocity of sound.

  7. U.S. Standard Atmosphere - Wikipedia

    en.wikipedia.org/wiki/U.S._Standard_Atmosphere

    The U.S. Standard Atmosphere is a static atmospheric model of how the pressure, temperature, density, and viscosity of the Earth's atmosphere change over a wide range of altitudes or elevations. The model, based on an existing international standard, was first published in 1958 by the U.S. Committee on Extension to the Standard Atmosphere, and ...

  8. This standard atmosphere calculator is based on the 1976 model of the U.S. Standard Atmosphere 1976_Std_Atm_NASA-TM-X-74335. Two input options are modeled, you can either provide: altitude and ambient temperature. altitude and temperature offset (from Std. Atm.)