Question #15384

obtain the heat flow equation(1.3) as follows: the quantity of heat Q flowing across a surface is proportional to the normal component of \
the (negative) temperature gradient, (-\[Del]T).n
compare chapter 6 equation (10.4) and apply the discussion of flow \
of water given there to the flow of heat, thus show that the rate of \
gain of heat per unit volume per unit time is proportional to \[Del].\
\[Del]T . But
\[PartialD]T/\[PartialD]t is proportional to this gain in heat ; thus \
show that T satisfies (1.3

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