Yes, the "thermodynamic temperature" uses the Kelvin scale, but here we're talking about whether V is proportional to T or not. And that depends on the temperature scale you use. This experiment is a demonstration of Charles' law. Usually, an objective of the experiment is to extend the line to the x-axis where V = 0. This extrapolated temperature where V is zero on the graph is absolute zero. That was the "pleasant surprise" I mentioned earlier. Here's a simple animation of it using Kelvin temperatures: http://www.grc.nasa.gov/WWW/K-12/airplane/aglussac.html. When the Kelvin temperature is used, the temperature when V = 0 is zero Kelvin. If the Celsius scale is used, as in your graph, this temperature is _______.  |
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