# Homework Help: Thermal Conductivity Problem

1. Jun 10, 2007

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1. The problem statement, all variables and given/known data
So, we have ice at a steady state, and above it is Air at -5.2 celcius, and below it is water at 3.98 C. The total depth of the ice and the water is 1.42m, and they want us to find the thickness of the ice. The thermal conductivies (k) of ice and water are 1.67 and 0.502 respectively.

2. Relevant equations

Rate of heat flow=(k)(A)(delta T)/(l)

3. The attempt at a solution

It says the ice is in a steady state, so there is an even flow of heat to the air and to the water. So I know i'm setting two equations equal too each other. I also know the area is not given, but it will cancel in the two equated equations. What I don't know is what delta T i am meant to be measuring, and where the depth of the ice fits in at all. Any point in the right direction would be appriciated

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