Uploaded March 2021 | Updated September 2026, 3 minutes ago
The pressure law describes the relationship between the pressure of a gas and its temperatures, when the gas is kept at a fixed volume.
This video demonstrates an experiment to investigate this relationship, allowing results to be taken from the video.
A few comments:
First of all, you will notice that the computer gives a silly number of significant figures. I should have got it to round the numbers down to a more appropriate level.
The video was recorded using time lapse. The experiment was actually carried out over a period of about 30 minutes.
You will also notice that the temperature rises quickly to begin with and then tails off as it gets hotter: This is because the apparatus is losing heat to the surroundings. I struggled to get temperatures above 66 degrees celsius and so had to turn up the bunsen flame towards the end of the experiment.
The results can be used to estimate the value of absolute zero. I've found that the experiment always seems to give too high a value (I got about -260, based on the data in the video) - not sure why. If you have any thoughts, please let me know in the comments. For a more accurate estimate of absolute zero I recommend watching my video on Charles' law.
The pressure law describes the relationship between the pressure of a gas and its temperatures, when the gas is kept at a fixed volume.
This video demonstrates an experiment to investigate this relationship, allowing results to be taken from the video.
A few comments:
First of all, you will notice that the computer gives a silly number of significant figures. I should have got it to round the numbers down to a more appropriate level.
The video was recorded using time lapse. The experiment was actually carried out over a period of about 30 minutes.
You will also notice that the temperature rises quickly to begin with and then tails off as it gets hotter: This is because the apparatus is losing heat to the surroundings. I struggled to get temperatures above 66 degrees celsius and so had to turn up the bunsen flame towards the end of the experiment.
The results can be used to estimate the value of absolute zero. I've found that the experiment always seems to give too high a value (I got about -260, based on the data in the video) - not sure why. If you have any thoughts, please let me know in the comments. For a more accurate estimate of absolute zero I recommend watching my video on Charles' law.
