The Laws of Thermodynamics
The discussion in the previous chapter focussed heavily on the amount of energy in a system. But how did that energy get there in the first place—and what is energy, anyway? Energy is a central idea in physics, but like other basic precepts of the world in which we live, we really have no idea what it is. Perhaps the question has no meaning or can never be answered, since an answer presumably must be expressed in terms of other quantities, forming a chain that eventually arrives at a quantity that cannot be defined in terms of anything else.
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