Question

"Heat conduction to skin": Suppose 175 W of heat flows by conduction from the blood capillaries beneath the skin to the body's surface area of 1.5 m2. If the temperature difference is 0.70°C, estimate the average distance of capillaries below the skin surface.

Answer 1

Answer:

Explanation:

Thermal conductivity of human skin K = 21 W / m²

Formula for heat conduction

Q = KA ( θ₂ - θ₁) / d

A is surface area ,  θ₂ - θ₁ is temperature difference , d is thickness .

Putting the values

175 = 21 x 1.5 x .70 / d

d = .126 m

= 12.6 cm .