Ep 119: Work and Heat: An introduction to thermodynamics (a prelude to Ch 6 of ”The Science of Can & Can’t).
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The Internal Energy of the Water
When the temperature rises in a system, like a cup of water or whatever, we say that U has increased. Now what the internal energy is exactly, we don't need to worry ourselves about exactly if we're doing classical thermodynamics. We just know that it's gone up or gone down because then we can calculate the change by making measurements. The thing is, if we take away the insulation, then more energies required in order to achieve the same rise in temperature. But why should that be? Where is the energy going? I know we know it's common sense, it's going into the surroundings because the thing is uninsulated anymore. Hence we have this concept of heat.
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