What I can say is, oh, this water bottle has x amount of enthalpy, okay? And that's because enthalpy is defined using a formula. So when somebody asks you what enthalpy is, you tell them it's a formula. And the formula is this the change in enthalpy is equal to change in U plus P times change in B. So let's see what this guy is. This guy is just a total internal energy of the system, okay?