Searle's bar method (named after George Frederick Charles Searle) is an experimental procedure to measure thermal conductivity of material.
A bar of material is being heated by steam on one side and the other side cooled down by water while the length of the bar is thermally insulated.
Then the heat ΔQ propagating through the bar in a time interval of Δt is given by where and the heat ΔQ absorbed by water in a time interval of Δt is: where Assuming perfect insulation and no energy loss, then which leads to
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