On doubling P and volume with constant T, the equilibrium constant (AT) will remain constant. Pressure will never affect the value o f K . It may result in the shifting o f equilibrium but not the equilibrium constant value. Temperature always changes K because on adding heat to a system in state of equilibrium will always alter the forward reaction rate differently than the reverse reaction rate. Also by doubling the volume, the concentrations of both reactants and product evenly become half. Therefore, overall there is no change in equilibrium constant value (K ).