In geophysics, admittance describes the small effects of atmospheric pressure on earth gravity. Studies have also been carried out regarding the gravity of Venus. Admittance in geophysics takes atmospheric pressure as the input and measures small changes in the gravitational field as the output. Geophysics admittance is commonly measured in μGal/mbar. These units convert according to 1 Gal = 0.01 m/s2 and 1 bar = 100 kPa, so in SI units the measurement would be in units of;
or or or, in primary units
However, the relationship is not a straightforward one of proportionality. Rather, an admittance function is described which is time and frequency dependent in a complex way.
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- Hoogenboom, Trudi (2004). "Admittance survey of type 1 coronae on Venus". Journal of Geophysical Research 109. doi:10.1029/2003JE002171.
- Abd El-Gelil, Pagiatakis, El-Rabbany, (July 2006). "Atmospheric Air Density Admittance Function for High Precision Gravity Reduction". Elements: the newsletter of the Canadian Geophysical Union 24 (2).