So when that process actually takes place, a certain amount of energy is exchanged between that system and the surroundings. So let's suppose that the energy left ourselves and entered our surroundings. What exactly does that mean about the entropy of the surroundings? Well, because the energy left the system and it dispersed throughout the surroundings, that means the entropy of the surroundings increased in this particular case, and in this case, we can define what the entropy is in terms of the amount of energy that's left the system and the temperature of that particular system. So the way that we define entropy in physics is the change in entropy of the surroundings, which is a positive value as long as entropy left our system is equal to the quantity of entropy, the quantity of energy that left the system as a result of heat divided by the temperature given to us in Kelvins. Now, the negative sign simply means when the enthalpy when the heat basically flows out of the cell, when the energy is absorbed by the surroundings, this system loses energy, but the surroundings gains that energy.