TheBigBangggggg Exactly, the temperature is directly proportional to the pressure for a fixed amount of gas at a constant volume. It can be calibrated to an absolute temperature scale because of the zeroth law of thermodynamics.
Heating the gas after the initial measurements increase the volume of the gas. This expanded gas tries to force the mercury out of the tube on the left-hand side. As there is now a difference in the heights of the mercury on the left and right-handed sides there is a pressure gain of rho g h. This is also the increase in pressure of the gas that has been heated. As there is now both pressure and volume change then this is no good for using as a thermometer as we only want one change. Lifting the left-hand side increases the pressure so it starts to compress the gas. You keep lifting until the right-hand side is back to where it started so the volume of the gas is now what it was, to begin with. This new height difference between the left and right-hand sides is what you are after as it is only pressure that has changed in response to the temperature change. I hope that helps.
@@sibiramm6107 Unfortunately, I'm working in a school in the Middle East at the moment that really has very little in the way of equipment. I have been offered a job back in the UK starting in September which is much better resourced. Maybe I'll do one then, if you can wait.
@@alevelphysics4359 if you reduce the pressure to almost zero, isolate the system by closing the end, attach a pressure gage, you make a really good thermometer. Is it possible ? yes it is xD. ( anyway, you are right, my last comment was not very useful)
Greatly explained. This video's enough for beginners. Wish my prof could explain with this simplicity
Thank you very much.
Great video.
Nicely explained! But how do we get the temperatures from this? With the ideal gas law?
TheBigBangggggg Exactly, the temperature is directly proportional to the pressure for a fixed amount of gas at a constant volume. It can be calibrated to an absolute temperature scale because of the zeroth law of thermodynamics.
Thank you soo much btw can you please explain how will lifting mercury increases pressure of mercury and compresses the gas
Best explanation 👍
Obrigado! Thank you
How does raising the height of the mercury tube compress the gas. If its the weight from mercury, wouldn't that be the same at any height on earth mg.
Heating the gas after the initial measurements increase the volume of the gas. This expanded gas tries to force the mercury out of the tube on the left-hand side. As there is now a difference in the heights of the mercury on the left and right-handed sides there is a pressure gain of rho g h. This is also the increase in pressure of the gas that has been heated. As there is now both pressure and volume change then this is no good for using as a thermometer as we only want one change. Lifting the left-hand side increases the pressure so it starts to compress the gas. You keep lifting until the right-hand side is back to where it started so the volume of the gas is now what it was, to begin with. This new height difference between the left and right-hand sides is what you are after as it is only pressure that has changed in response to the temperature change.
I hope that helps.
@@alevelphysics4359 but still didn't answer why lifting the left side of the tube pushes the mercury down.
@@joseps637 ruclips.net/video/n0xAQXL905c/видео.html this is another video I did. Perhaps it might help if you see the real thing in action.
Could u make a video on constant pressure gas thermometer 👍
Thanks for the suggestion. I'm sure, if you search for 'Charles' law' you will find what you are looking for.
@@alevelphysics4359 but i do need like a working video like yours
@@sibiramm6107 Unfortunately, I'm working in a school in the Middle East at the moment that really has very little in the way of equipment. I have been offered a job back in the UK starting in September which is much better resourced. Maybe I'll do one then, if you can wait.
Thank you sir 😊
should we measure height after restoration of level after rising or before it ?
After, so that the volume is the same
@@alevelphysics4359 thanks
Life saver
Thank you sir
Thanks teacher
Thank u sir...
if you do not close the end of the tube, this thermometer will be influenced by atmosferic pressure
Yes, can you think what would happen to it's workings if you closed the end of the tube? What would it then be influenced by?
@@alevelphysics4359 if you reduce the pressure to almost zero, isolate the system by closing the end, attach a pressure gage, you make a really good thermometer. Is it possible ? yes it is xD. ( anyway, you are right, my last comment was not very useful)
why the formula i get from the book is p = p0 - p.g.h
I suspect it's because they are cooling down the gas so that the mercury is going up on the otherside of the U-bend
Hello ! Just sayin your voice sounds like avomane ... another youtuber .. great vid tho
Which language r u speaking
Français merd du tête!
physics language ,lol
Voice quality not good!!!
I'm not a professional and I don't have a lot of kit, just my tablet. I'm sorry it's not up to your standard.
Total rubbish
You're such a dick!