The K-value does not necessarily increase when the temperature increases, but may also decrease. K-value is the equilibrium constant of a reversible reaction, which refers to the ratio of the product of the concentrations of the product and the reactant when the reversible reaction reaches equilibrium under certain conditions such as temperature, pressure, ionic strength, etc. The significance of the K-value is the extent to which the reversible reaction is carried out, and the greater the K-value, the more thoroughly the reaction is carried out. In the case of a certain temperature, the K value of a reversible reaction is a constant, that is to say, the magnitude of the K value is only affected by the temperature. When other conditions remain unchanged, if the forward reaction of a reversible reaction is heat-absorbing, the equilibrium of the reaction moves in the direction of the forward reaction as the temperature rises, and the K value increases; if the forward reaction is exothermic, the equilibrium of the reaction moves in the direction of the reverse reaction as the temperature rises, and the K value decreases.