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.

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

Since the real atmosphere never remains constant at any particular time or place, a hypothetical model must be employed as an approximation to what may be expected. This model is known as the standard atmosphere.

The International Standard Atmosphere (ISA) model is an average representation of an ideal atmosphere. It is based on thermodynamic relationships (equation of state) and assumes that the atmosphere lacks water vapor, wind, and turbulence.

Also known as the ICAO Standard Atmosphere, ISA is a standard against which to compare the actual atmosphere at any point and time. The ISA is based on the following values of pressure, density, and temperature at mean sea level each of which decreases with increase in height:

Pressure, temperature, density, viscosity and speed of sound variation for the international standard atmosphere (ISA) can be calculated for a range of altitudes from sea level upward. This is done using an exact solution to the hydrostatic equation for a column of air.

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 altitude s or elevation s.

2020年5月24日 · International Standard Atmosphere (ISA) The knowledge of standard atmosphere is required for producing pressure instruments, performing data reductions of flight tests, and pronouncing certain safety regulations for the aircraft.

International Standard Atmosphere (ISA) is a model used for the standardization of aircraft instruments. It was established, with tables of values over a range of altitudes, to provide a common reference for temperature and pressure.

The International Standardization Organization (ISO) has defined a standard atmosphere based on the model established by the ICAO in their Document 7488/2, Second Edition, 1964. The data in Table B.1 define the state variables at sea level (SL) and the gravitational acceleration at 45 northern latitude on which the potential altitude is based.