ols ▁less ▁than ▁a ▁dry ▁one ▁would ▁as ▁it ▁r ises ▁( its ▁temperature ▁changes ▁with ▁height ▁at ▁the ▁mo ist ▁ad i ab atic ▁lap se ▁rate , ▁which ▁is ▁smaller ▁than ▁the ▁dry ▁ad i ab atic ▁lap se ▁rate ). ▁Such ▁a ▁s atur ated ▁par cel ▁of ▁air ▁can ▁achieve ▁bu oy ancy , ▁and ▁thus ▁acceler ate ▁further ▁up ward , ▁a ▁run away ▁condition ▁( inst ability ) ▁even ▁if ▁potential ▁temperature ▁increases ▁with ▁height . ▁The ▁sufficient ▁condition ▁for ▁an ▁air ▁column ▁to ▁be ▁absolutely ▁stable , ▁even ▁with ▁respect ▁to ▁s atur ated ▁con ve ct ive ▁mot ions , ▁is ▁that ▁the ▁equivalent ▁potential ▁temperature ▁must ▁increase ▁monot on ically ▁with ▁height . ▁ ▁Formula ▁A ▁number ▁of ▁approximate ▁form ulations ▁are ▁used ▁for ▁calculating ▁equivalent ▁potential ▁temperature , ▁since ▁it ▁is ▁not ▁easy ▁to ▁compute ▁integr ations ▁along ▁motion ▁of ▁the ▁par cel . ▁ ▁Bol ton ▁( 1 9 8 0 ) ▁ ▁gives ▁review ▁of ▁such ▁procedures ▁with ▁estimates ▁of ▁error . ▁ ▁His ▁best ▁approximation ▁formula ▁is ▁used ▁when ▁accuracy ▁is ▁needed : ▁ ▁Where : ▁▁ ▁is ▁( d ry ) ▁potential ▁temperature ▁[ K ] ▁at ▁the ▁lifted ▁cond ens ation ▁level ▁( L CL ), ▁▁ ▁is ▁( appro xim ated ) ▁temperature ▁[ K ] ▁at ▁L CL , ▁▁ ▁is ▁temperature ▁[ K ] ▁of ▁air ▁at ▁pressure ▁, ▁▁ ▁is ▁de w ▁point ▁temperature ▁at ▁pressure ▁, ▁▁ ▁is ▁pressure ▁at ▁the ▁point ▁[