Whilst studying the heat equation, I ran into the equality\[e(x,t)=c(x)\rho(x)u(x,t),\]where \(e\) is the thermal energy density, \(c\) is the specific heat, \(\rho\) is the mass density, and \(u\) is the temperature.
Why is this true, who came up with it, and how?

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that comes from the definition of specific heat capacity ...

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