The goal of this experiment is to measure the rate of heat transfer of copper and steel and compare. The rate of heat transfer
$$ H = \frac{k A \Delta T}{L} $$
where $k$ is thermal conductivity which has the units [W m$^{-1}$ K$^{-1}$], $A$ is the cross-sectional area of the conductor, $L$ is its length and $\Delta T$ is the difference in temperature between the two ends of the conductor.
The thermal conductivity of copper and steel are given below.
| Material | Thermal conductivity [W m$^{-1}$ K$^{-1}$] |
|---|---|
| Copper (Cu) | $401$ |
| Steel (Fe+C) | $14$ |
Using a Vernier calipers measure the radius of the rods and from the radius ($r$) calculate $A=\pi r^2$.
Using a thread and a meter scale measure the length $L$ of the rods.
Measure the temperature changes and note down in the following table.
| Time [minute] | Temperature of Copper [$^\circ$C] | Temperature of Steel [$^\circ$C] |
|---|---|---|
| 0 | ||
| 1 | ||
| 2 | ||
| 3 | ||
| 4 | ||
| 5 |
Compare $H_c$ and $H_s$ in units of J min$^{-1}$.