<Dd> d S d z = 0 (\ displaystyle (\ frac (dS) (dz)) = 0) </Dd> <P> where S is the entropy . The above equation states that the entropy of the atmosphere does not change with height . The rate at which temperature decreases with height under such conditions is called the adiabatic lapse rate . </P> <P> For dry air, which is approximately an ideal gas, we can proceed further . The adiabatic equation for an ideal gas is </P> <Dl> <Dd> p (z) T (z) − γ γ − 1 = constant (\ displaystyle p (z) T (z) ^ (- (\ frac (\ gamma) (\ gamma - 1))) = (\ text (constant))) </Dd> </Dl>

What is the situation called when temperatures increase with height in the troposphere