Aperson's body is covered with 1.69 m^2 of wool clothing. the thickness of the wool is 1.87 × 10^-3 m. the temperature at the outside surface of the wool is 13.9 °c, and the skin temperature is 35.4 °c. how much heat per second does the person lose due to conduction?

The concept required to solve this problem is related to heat conductivity as a function of time.

Mathematically in a stable state the heat flux is constant and its rate of change as a function of time can be described under the function

Where

k= Coefficient of thermal conductivity

A = Area of the object

=Temperature difference across object

d= thickness of object

According to the values given we have then,

Replacing we have,

Therefore the quantity of heat per second does the person lose due to conduction is 777.21J/s

if the thermos has a vacuum innner, then heat through conv currents and conduction are reduced = vacuum flask

1/0.14nm = 10^10/1.4 a lot