Fig 4 - uploaded by Halit Eren
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Change in the atmospheric pressure due to air density. These changes in the air pressure can be related to altitude by using the gas laws.
Source publication
Alimeters are instruments that measure altitude or elevation objects above or below a given level. There are three types of alimeters: pressure altimeters that make use of properties of atmosphere, radio and radar altimeters that are based on electromagnetic wave propagation, and optical altimeters that use optical properties of light and lasers. A...
Context in source publication
Context 1
... these assumptions, the altitude versus static pressure relationship can now be derived by consid- ering Fig. 4. A small change in pressure, dp, of air with density ρ, due to a small change in height, dH, can be found by equating the forces acting in the vertical plane on an elemental volume of air, so that where g is the gravitational acceleration. From the gas law, where T is the air temperature (K) and R a is the gas constant for a unit mass ...
