<P> the thermodynamic equilibrium constant is defined in terms of the activities, (AB), (A) and (B), of the species in equilibrium with each other . </P> <Dl> <Dd> K = (A B) (A) (B) (\ displaystyle K = (\ frac (\ (AB \)) (\ (A \) \ (B \)))) </Dd> </Dl> <Dd> K = (A B) (A) (B) (\ displaystyle K = (\ frac (\ (AB \)) (\ (A \) \ (B \)))) </Dd> <P> As activity is a dimensionless quantity, K is dimensionless . </P>

What is a characteristic of chemical equilibrium but not physical equilibrium