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Interactive atmospheric pressure map. ICON and GFS models. Shows global forecasted mean sea-level pressure.
Standard sea-level conditions (SSL), also known as sea-level standard (SLS), defines a set of atmospheric conditions for physical calculations. The term "standard sea level" is used to indicate that values of properties are to be taken to be the same as those standard at sea level, and is done to define values for use in general calculations.
International Standard Atmosphere properties like pressure, temperature, density, viscosity, thermal conductivity and velocity of sound are indicated below. ρo = 1.2250 kg/m3.
This is in contrast to mean sea-level pressure, which involves the extrapolation of pressure to sea level for locations above or below sea level. The average pressure at mean sea level in the International Standard Atmosphere is 1,013.25 hPa, or 1 atmosphere (atm), or 29.92 inches of mercury.
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).
In this table from -5 to 280 kft in 5 kft intervals. alt is altitude in thousands of feet. sigma is density divided by sea-level density. delta is pressure divided by sea-level pressure. theta is temperature divided by sea-level temperature. temp is temperature in degrees Rankine. pressure is pressure in pounds per square foot. dens is density ...
26 gru 2021 · The following charts compare these four atmospheres with the standard atmosphere. Also shown are two atmospheres obtained by simply adding a fixed increment of temperature at each altitude. Vertical scale is temperature in degrees Rankine.
