A constant is a fixed value that does not change during the execution of a program. Constants are used to store values that are not meant to be modified. They provide a way to give a meaningful name to a value and make the code more readable and maintainable.
for variables x and y and constanat k -
The ionic product constant of water, Kw, is temperature dependent because the dissociation of water into hydronium ions (H3O+) and hydroxide ions (OH-) is an endothermic reaction. As temperature increases, more water molecules dissociate into ions, leading to an increase in the concentration of H3O+ and OH- ions, thus affecting the value of Kw.