So let's begin with temperature. Suppose we have the following reaction in which 1 mol of among the gas state reacts with three moles of diatomic H two plus the gas state to produce two moles of ammonia alter the gas state and heat. So this is an exothermic reaction. Now, whenever we're talking about lushly as principle and we see that we have heat produced or heat in the beginning, that means we can treat this heat sky as a product. So our heat is tangible, okay? So now let's increase the temperature of our system of our reaction.