An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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adiabatic temperature gradient
  زینه‌ی ِ دمای ِ بی‌دررو  
zine-ye damâ-ye bidarrow
Fr.: gradient de température adiabatique  

The temperature gradient defining the → radiative equilibrium
condition in a region. It is expressed as: dT/dr = (1 - 1/ γ)((T / P)(dP / dr), where T and P are temperature and pressure, dT / dr and dP / dr temperature and pressure gradients respectively, and γ = CP / CV.
For radiative equilibrium to be stable against → convection, the actual temperature gradient must be less than the adiabatic temperature gradient, i.e. |dT /dr|rad < |dT /dr|ad. See also → Schwarzschild’s criterion.

See also: → adiabatic; → temperature; → gradient.