Which piece of evidence best supports Charles’s law?

Charles's Law states that the volume of a gas is directly proportional to its temperature (in Kelvin), provided the pressure remains constant. The best evidence supporting Charles's Law can be found through experimental data demonstrating this relationship.

A classic demonstration involves heating a balloon. When the balloon is heated, the air inside expands, causing the volume of the balloon to increase. Conversely, if the balloon is placed in a cold environment, the volume decreases as the gas inside cools.

The mathematical representation of Charles's Law is given by the formula:

\[
\frac{V_1}{T_1} = \frac{V_2}{T_2}
\]

Where \(V\) represents volume and \(T\) represents temperature in Kelvin. Observations that correlate the change in volume with varying temperatures, while maintaining pressure, constitute strong evidence for Charles's Law. Experimental data collected under controlled conditions demonstrating this direct relationship would be considered the best support for the law.