From ExoDictionary
Jump to: navigation, search
This definition page has been automatically generated.
You can help ExoDictionary by expanding, updating, or correcting it.

This autostub has not yet had its initial copyediting proof and may contain significant formatting and even factual errors. You can improve Exodictionary by cleaning up the page markup and verifying that the definition is correct and then removing this tag.

This autostub has not yet had its initial categorization proof and may be categorized incorrectly. You can improve Exodictionary by removing inappropriate categories and then removing this tag.


The state of a fluid in which surfaces of constant density (or temperature) are coincident with surfaces of constant pressure; it is the state of zero baroclinity. Mathematically, the equation of barotropy states that the gradients of the density and pressure fields are proportional:

Missing Image:IMG src="equat/34bar.gif"

Missing Image:IMG height=13 src="equat/rhosm.gif" width=11 is the density; p is the pressure; and B is a function of thermodynamic variables, called the coefficient of barotropy.
With the equation of state, this relation determines the spatial distribution of all state parameters once these are specified on any surface. For a homogeneous atmosphere, B=0; for an adiabatic atmosphere,

B = c v / cp RT

cv and cp are the specific heats at constant volume and pressure, respectively; R is the gas constant; and T is the Kelvin temperature; for an isothermal atmosphere, B = 1/RT.


This article is based on NASA's Dictionary of Technical Terms for Aerospace Use