In this experiment, I learned about how different gases show the relationship between
volume and temperature. This relationship is stated in Charles’s Law and was proved to be true
in both of the experiments I conducted. In the first experiment, I filled a flask with methane and
closed it so that none of the gas could escape. A syringe was then inserted into the flask, and a
thermometer. After cooling the flask to various degrees, I was able to measure the volume of the
syringe, the total volume of the flask and the syringe, as well as the temperature of the flask.
When the temperature of the constant water bath increased, the total volume and temperature of
the flask also increased. For example, when I began the experiment at a 40 °C water bath, the
flask had a temperature of 313.1 K and a volume of 239.1 mL. When I finished the experiment at
100 °C, the temperature was 373.1 K and the volume was 285 mL. As the temperature increased,
so did the volume of the flask. For the graph I created, I used the equation v = 0.7641t - 0.0904.
This is the slope intercept of the graph, and by using this I was able to identify any unknown
volume values not seen in the graph. In this equation, the volume is equal to the temperature
multiplied by the slope which I then subtracted the y-intercept from. This shows that the volume
is directly proportional to the temperature.
In the second experiment conducted, I used the gas Butane. I performed the same
experiment, where I used a constant water bath to cool the flask until the temperature remained
constant. As the temperature increased, so would the volume of the flask. I observed how the
total volume of the flask would increase each time the temperature increased. As the constant
water bath went from 80 °C to 100 °C, the temperature went from 353.1 K to 373.1 K and the
volume increased from 269.7 mL to 285.0 mL. In the graph shown, I used the equation v =
0.7645t - 0.236. Just like with my other graph, I was able to use this equation to find the
unknown volume values. This shows a direct relationship between temperature and volume,
proving Charles’s Law to be true.