When to use P when finding Equilibrium Constant

[105679122]

After looking at the solutions for some of the textbook problems, I noticed that when asked to find an equilibrium constant the answer was always in terms of pressure. Is this something we need to do as well or just how our textbook chooses to do it. I know that regardless the solution is the same but I was just wondering because even questions that do not ask for the equilibrium constant in terms of pressure are given in times of pressure.

[Sally_Luo_3F]

I believe that when we use Kp it is usually when the equations are all gases, so we use partial pressure to measure it. If the chemical equation is consist of aqueous solutions then we use Kc (concentrations)

[annaneiger]

I'm pretty sure this is when we are using Kp, or the equilibrium constant in terms of partial pressures! This is different than Kc, which involves concentrations.