Heat and Mass Transfer
According to Newton's law of cooling, the heat transfer from a hot body to a cold body is

Either (A) or (B)
Directly proportional to the difference of temperatures between the two bodies
Both (A) and (B)
Directly proportional to the surface area

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Heat and Mass Transfer
Fourier's law of heat conduction is (where Q = Amount of heat flow through the body in unit time, A = Surface area of heat flow, taken at right angles to the direction of heat flow, dT = Temperature difference on the two faces of the body, dx = Thickness of the body, through which the heat flows, taken along the direction of heat flow, and k = Thermal conductivity of the body)

k. (dT/dx)
k. A. (dT/dx)
k. A. (dx/dT)
k. (dx/dT)

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