Oh!I understand! I have learned a lot. I am an electrical engineer who works in a power plant in PR. The way you teach the thermodynamics concepts is amazing. For me this is very important, I bought a notebook and I spend several hours a day analizing all the videos series. Thanks for being my teacher.
That is a good idea. As we are making more videos, it makes sense to group the playlists together. When we are done with physics in a few months we'll group them together in comprehensive categories. Thanks for the suggestion.
Barometre and variantLy sensitive pressure in many fields AirPressure is present in a○round---O earth Main pressure conDucTibLity is o2.co2.smoke within circumFerence of earth hence as gas expands on ⤴️farhenheits Derives response of gasExpansion to farhenheits MightB also deGrade farhenheits to minus Freeze state that obviously contractSpace occupancy of gases hence reduces pressure ie HG liquid metaL hg[:: ] barometre pressure measured in microMiLimetre The measured response of gas to thermaL variations is + nEwS multiDirectional expansion by 2oooCuCmS to 3OOOCuCmS for 2ooUnits ⤴️ oFarhenheits tending from zero to 2oo°F in 5oSec Derivative : x ------> tends to ⤴️ 2ooUnits X MightB 2o°F oR 3o°F oR zero to higherLeveL for any constant unit pressure to any container example: capsule of boiengs Hence preferring fiberCarbon body + alloys to restrict extrinsic factors to intrinsic environment of airCrafTs being metaLs hard capsule alumni+ lead+ cu: circuits etc while rubberTube of truckTyre is inflateDeFLatabLe altering to pressure ---> does touch ground in afterNoon altering the inflation expansion thou quantity of gas is constant i.e. a○ 5ooCubiCmS thou inflated BuT in boiengSame phenomenon of gaSuperiority is restricted to prevent ossicLe burst:aborTion:auditory⤴️hg vaguStimulated sa.node depression The very dim concentration of discussions about vagus conducting sa.node inhibitions has intensce critics in highaLtitude cardiacArrest and similar transFormation of ovarian cysTo carcinoma by hypoBaric pressurExtrinsic to boiengs and hyperbaric ⤴️pressure in airCrafTs thou gasVolume[a○ 3oOOOCuCc] in capsule of aircraft had been same while takeOff and iSame CuCc at ⤴️ altitude BuT Uv raises expansion as away from earth is near to sun BuT ⤴️ in gasPressure is restricted allowing onLy few reminance of pressure variations to CardioVaSystem [ negligible] by fibreAlloy coaTo capsulExtending from nose [noT beaK] to caudaeFiN logitudinally Lighting freight of airCrafTs defines column between passengers carpeTo fueL tank Defining the strongHoLd column being NoT dorsaL column asTo in bovine BuT resembles vertebrate column of sharK ie midSTreamLine ventraLLy located anD NoT dorsum Abilitates torsion resistance at both upper and lower hemisphere of aircraft by AXiaL section ie column at ventraLLy midSTreamLineD.istance The ovarian blastocyst converts to bLasted cysT eroding uLcers progression to carcinoma [ nonHealed] by moisT intrinsic situation in mesentric fossa When hgMicroMetric pressure ⤴️ in ossicLe praportioned ⤴️in ovarianCysT because both ossicLe has liquidHumoR and cysT in ovarian part is liquid in eggShell type brittle cysT Next lecture on medical devices Utube
There seems to be an error in here. You wrote L = 0.0065 c/m at the top, but in the calculations down below you replaced L with 0.0065 K/m . 0.0065 centigrade is 273.1565 Kelvin. Am I missing something!
@@MartinJoss01 Celsius and Kelvin have the same numerical size, so you can use either of those units if you take the difference between two diferent Celsius or Kelvin temperatures; there is a linear relationship between them, which can be stated as K = C + 273.15. However, Kelvin is the SI unit for temperature, so you generally need to use that unit during calculations. If you want to be on the safe side, then it might be a good idea to always use Kelvin in all situations.
What is a practical way of determining the lapse rate? Potentially measuring humidity at ground level? Othereiwse the lapse rate could practically be anywhere between 5K/km to 9.8K/km
I have got alot of new things in your video. Really I am lucky when I get you in online. I have a question. I have a pressure data to measure wind speed. that is 90, 80, 70, 60, 50, 45, 40, 35, 30, 25, 20, 15, 12, and 10 hpa by this pressure there is recorded the wind speed. is that possible to convert this pressure into altitude by using your formula? thank you
@@MichelvanBiezen Ok proffessor. I have 15 years data. in fixed pressure level there is a recorded data. Foreaxample in 90 hpa there is 15 years wind speed. I want to convert this pressure into height.
If you are asking if there is a relationship between pressure and height, the answer is yes. However with the atmosphere, there are many variables. At sea level the pressure can vary from 980 to 1030 mbar due to weather variations, so any conversion between pressure and height will require to use the stanard pressure of 101,325 Pa for 1 ATM, understanding that there will be natural variations.
Air molecules, like everything else at the Earth's surface is attracted to the Earth, due to the gravitational force. In order for an object (including air molecules) to leave the gravitational pull of the Earth they must move fast enough and exceed the escape velocity of the Earth which is about 25,000 miles per hour (40,000 km/hour). Very few air molecules move that fast and therefore the atmosphere of the Earth cannot escape to space. (Mars and Merculy however are not big enough and therefore have lost most of their atmospheres.)
@@MichelvanBiezen why would they have to move 25kmph though? If the air at the edge of the atmosphere is right next to the vacuum of space, how come gravity is stronger?
Air pressure is caused by the weight of the molecules above them. For each square inch of surface on the Earth there is a column of air above it that weighs 14.7 pounds. The higher you go up into the atmosphere, the less air you will have above you and therefore the less pressure you will experience. By the time you reach the upper atmosphere the pressure is nearly zero, and the difference between the atmospheric pressure and the pressure in space is zero. Therefore no molecules are "sucked" into space. They can only escape from the Earth (like all other objects on the Earth) if they travel faster than the escape speed.
Hello sir, If we are given temperatures( from sea level and from tropopause ), how can we calculate tropopause height? I use this formula, where I assumed P=1013hpa, P(0)is 1 atm
What if we have to calculate the rate of change of temperature of Earth's troposphere with pressure dP/dT, given scale height is 8km, and lapse rate 6.5°C/m. Please help sir!!!
can we have separate play lists for the subjects ,like the math in one list and the physics in another and so ,could you please prof consider that ,thanks
everything seems to take longer because water will boil at a LOWER temperature because the pressure is LOWER there.... MAY BE I DONT GET IT.. WILL SOMEONE EXPLAIN..
The point at which water begins to boil, (when the vibrational motion due to the temperature of the water, is able to cause the molecules to jump free from the pull of the other molecules), is determined by how much the air pressure can push back. The higher the air pressure the more the air pushes back to more energy (heat) is required for the molecules to break free from the liquid.
bcs we are going away from the source of heat. In this case the source of heat is Earth which heats the lower atmosphere by sensible heat and longwave radiation.
because we are going away from the source of heat. In this case the source of heat is Earth which heats the lower atmosphere by sensible heat and long wave radiation.
A change in height of 1km produces a pressure change of 100hpa~0.098692327atm If there is a 2km difference & P1=1atm, then P2/P1~1.2 => 293.15*1.2^.286 -273.15~35.7 deg C Questions: 1. Could there were a way to capture this change in heat...? 2. Could the difference between the cold and warm sides of a mountain that have "Chinook winds" be exploited...?
+Shadi Alaghbari No, that would only be at a specific spot and the temperature is calculated relative to that. The temperature at sea level changes drastically all over the world.
@@MichelvanBiezen I would also like to know if the hidrogen found in our sun also works as a diatomic molecule, because i've been using 0,001kg/mol as molar mass the whole time :D
The amount of nitrogen on the Sun is very small compared to hydrogen and nitrogen. (You meant to say 0.014 kg/mol, yes?) At the temperatures of the Sun, there are no molecular bonds and the electrons are stripped away.
Some here might have seen how flat earthers make the claim that there cannot be a transition from atmosphere to "empty space" without some form of container. It might be worth repeating this problem but say look at being a 100 miles up to show them how totally wrong they are, not that they would either understand this or believe it but others who argue against them could cite this and help those who might be on the fence in buying into that nonsense but who don't have enough physics background to refute their claims and thus might give them some credence as such to that false claim.
Francisco. That is an interesting question. We just starting putting these videos on line a year ago, and we haven't productized them yet. So at this time they are not yet for sale, but they are free on TH-cam.
Oh!I understand! I have learned a lot. I am an electrical engineer who works in a power plant in PR. The way you teach the thermodynamics concepts is amazing. For me this is very important, I bought a notebook and I spend several hours a day analizing all the videos series. Thanks for being my teacher.
That is a good idea. As we are making more videos, it makes sense to group the playlists together. When we are done with physics in a few months we'll group them together in comprehensive categories.
Thanks for the suggestion.
You're the goat sir, .
Thank you. We appreciate your comment. 🙂
Barometre and variantLy sensitive pressure in many fields AirPressure
is present in a○round---O earth Main pressure conDucTibLity is o2.co2.smoke within circumFerence of earth hence as gas expands on ⤴️farhenheits Derives response of gasExpansion to farhenheits MightB also deGrade farhenheits to minus Freeze state that obviously contractSpace occupancy of gases hence reduces pressure ie HG liquid metaL hg[:: ] barometre pressure measured in microMiLimetre The measured response of gas to thermaL variations is + nEwS multiDirectional expansion by 2oooCuCmS to 3OOOCuCmS for
2ooUnits ⤴️ oFarhenheits tending from zero to 2oo°F in 5oSec
Derivative : x ------> tends to ⤴️ 2ooUnits X MightB 2o°F oR 3o°F oR zero to higherLeveL for any constant unit pressure to any container example: capsule of boiengs Hence preferring fiberCarbon body + alloys to restrict extrinsic factors to intrinsic environment of airCrafTs being metaLs hard capsule alumni+ lead+ cu: circuits etc while rubberTube of truckTyre is inflateDeFLatabLe altering to pressure ---> does touch ground in afterNoon altering the inflation expansion thou quantity of gas is constant i.e. a○ 5ooCubiCmS thou inflated BuT in boiengSame phenomenon of gaSuperiority is restricted to prevent ossicLe burst:aborTion:auditory⤴️hg vaguStimulated sa.node depression The very dim concentration of discussions about vagus conducting sa.node inhibitions has intensce critics in highaLtitude cardiacArrest and similar transFormation of ovarian cysTo carcinoma by hypoBaric pressurExtrinsic to boiengs and hyperbaric ⤴️pressure in airCrafTs thou gasVolume[a○ 3oOOOCuCc] in capsule of aircraft had been same while takeOff and iSame CuCc at ⤴️ altitude BuT Uv raises expansion as away from earth is near to sun BuT ⤴️ in gasPressure is restricted allowing onLy few reminance of pressure variations to CardioVaSystem [ negligible] by fibreAlloy coaTo capsulExtending from nose [noT beaK] to caudaeFiN logitudinally Lighting freight of airCrafTs defines column between passengers carpeTo fueL tank Defining the strongHoLd column being NoT dorsaL column asTo in bovine BuT resembles vertebrate column of sharK ie midSTreamLine ventraLLy located anD NoT dorsum
Abilitates torsion resistance at both upper and lower hemisphere of aircraft by AXiaL section ie column at ventraLLy midSTreamLineD.istance The ovarian blastocyst converts to bLasted cysT eroding uLcers progression to carcinoma [ nonHealed] by moisT intrinsic situation in mesentric fossa
When hgMicroMetric pressure ⤴️ in ossicLe praportioned ⤴️in ovarianCysT because both ossicLe has liquidHumoR and cysT in ovarian part is liquid in eggShell type brittle cysT
Next lecture on medical devices Utube
Sir, will you make any videos about the Magnetocaloric Effect (MCE)!
Thanks.
Probably not for a while. We still have a lot of basic material to cover in physics, math, and engineering. It is however a very interesting topic
Thank you thank you!!!
You are so welcome!
There seems to be an error in here. You wrote L = 0.0065 c/m at the top, but in the calculations down below you replaced L with 0.0065 K/m . 0.0065 centigrade is 273.1565 Kelvin. Am I missing something!
Celcius degrees are the same size as Kelvin degrees so you can use them interchangeably
@@MichelvanBiezen excuse me sir, but you did change the To from 20°C to 293K, can you explain it?
@@MartinJoss01 Celsius and Kelvin have the same numerical size, so you can use either of those units if you take the difference between two diferent Celsius or Kelvin temperatures;
there is a linear relationship between them, which can be stated as K = C + 273.15.
However, Kelvin is the SI unit for temperature, so you generally need to use that unit during calculations.
If you want to be on the safe side, then it might be a good idea to always use Kelvin in all situations.
What is a practical way of determining the lapse rate? Potentially measuring humidity at ground level? Othereiwse the lapse rate could practically be anywhere between 5K/km to 9.8K/km
The lapse rate depends on a lot of things, including relative humidity, geographical location, etc.
Very useful👌🏻, thank you doctor 🌹
I have got alot of new things in your video. Really I am lucky when I get you in online. I have a question. I have a pressure data to measure wind speed. that is 90, 80, 70, 60, 50, 45, 40, 35, 30, 25, 20, 15, 12, and 10 hpa by this pressure there is recorded the wind speed. is that possible to convert this pressure into altitude by using your formula? thank you
I am missing something with your question. What do you mean by: "I have a pressure data to measure wind speed" ?
@@MichelvanBiezen Ok proffessor. I have 15 years data. in fixed pressure level there is a recorded data. Foreaxample in 90 hpa there is 15 years wind speed. I want to convert this pressure into height.
If you are asking if there is a relationship between pressure and height, the answer is yes. However with the atmosphere, there are many variables. At sea level the pressure can vary from 980 to 1030 mbar due to weather variations, so any conversion between pressure and height will require to use the stanard pressure of 101,325 Pa for 1 ATM, understanding that there will be natural variations.
@@MichelvanBiezen So how can I convert 1o hPa into km?
@@tsehayenegash8394 See my comment above for a rough approximation.
congrats on 600k sir!!
Thank you!
sir i've been watching the series on thermodynamics and they are amazingly great but i was reaquesting if could do something on throttling process.
+Alonius Alex
I'll put it on the list. (I am working through a long backlog of requests). Thanks,
What about reversed question? Like what the altitude of specific known atmospheric pressure?
Solve the equation for h as the dependent variable and P becomes the independent variable.
Thank you this was helpful
Glad it helped
I made a simple air pressure formula for altitudes less than 30000 feet:
Let x=(altitude / 30000).
air pressure = 14.7 psi / (3.2^x)
What stops the air being sucked into the vacuum of space?
Air molecules, like everything else at the Earth's surface is attracted to the Earth, due to the gravitational force. In order for an object (including air molecules) to leave the gravitational pull of the Earth they must move fast enough and exceed the escape velocity of the Earth which is about 25,000 miles per hour (40,000 km/hour). Very few air molecules move that fast and therefore the atmosphere of the Earth cannot escape to space. (Mars and Merculy however are not big enough and therefore have lost most of their atmospheres.)
@@MichelvanBiezen why would they have to move 25kmph though?
If the air at the edge of the atmosphere is right next to the vacuum of space, how come gravity is stronger?
Air pressure is caused by the weight of the molecules above them. For each square inch of surface on the Earth there is a column of air above it that weighs 14.7 pounds. The higher you go up into the atmosphere, the less air you will have above you and therefore the less pressure you will experience. By the time you reach the upper atmosphere the pressure is nearly zero, and the difference between the atmospheric pressure and the pressure in space is zero. Therefore no molecules are "sucked" into space. They can only escape from the Earth (like all other objects on the Earth) if they travel faster than the escape speed.
what happens if the altitude is high enough to make the value becomes negative?
That is a good question. This is of course valid for the troposphere.
Thank you so much!
You're welcome!
thanks so much for these videos ! I have finally understood thermodynamics!
Hello sir, If we are given temperatures( from sea level and from tropopause ), how can we calculate tropopause height? I use this formula, where I assumed P=1013hpa, P(0)is 1 atm
Typically you would be given the lapse rate (the rate at which the temperature changes with height) in order to find the height of the tropopause.
@@MichelvanBiezen Yes, It is also given
Then it becomes lapse rate x height = difference in temperature (if the lapse rate is linear) otherwise you need to integrate over the height.
What if we have to calculate the rate of change of temperature of Earth's troposphere with pressure dP/dT, given scale height is 8km, and lapse rate 6.5°C/m.
Please help sir!!!
Does the L should not be in Kelvin?
Since we are dealing here with a CHANGE in temperature we can use C or K
Very interesting ❤️
Glad you think so!
Can you do a derivation video please 💖
can we have separate play lists for the subjects ,like the math in one list and the physics in another and so ,could you please prof consider that ,thanks
100 tonnes of pressure required how many times of atmospheric pressure????
"tons" is a unit of mass (not pressure). To convert that to pressure, you need "weight/area"
@@MichelvanBiezen 100 tonnes of weight is equal to how many atmospheric pressure 😇😇😇😇
Divided over how much of an area? (1 m^2 ?) If yes, then it is about 10 atmospheres
@@MichelvanBiezen what happened to a big building🏢 if we cover it with a clothes of jeans and make vaccum underneath it 😇😇😇📈will B7THHJMI 5
Will it going to be collapsed under huge pressure😇😇😇
everything seems to take longer because water will boil at a LOWER temperature because the pressure is LOWER there.... MAY BE I DONT GET IT.. WILL SOMEONE EXPLAIN..
The point at which water begins to boil, (when the vibrational motion due to the temperature of the water, is able to cause the molecules to jump free from the pull of the other molecules), is determined by how much the air pressure can push back. The higher the air pressure the more the air pushes back to more energy (heat) is required for the molecules to break free from the liquid.
Will the molar mass always remian the same? What if the value is not provided in the given numericals?
By definition, the molar mass is the mass of a specific quantity of molecules (a mol = 6.02 x 10^23)
@@MichelvanBiezen I want a solution for a numerical based on this. Can you help me out with that?
Sorry, but we are not sure what you are asking.
Sir are all these concepts needed for students of 12th standard.. And I'm from india
These videos are a good review for the exams you have to take in India.
@@MichelvanBiezen sir can you help me in solving numericals of physics
Sir please help me in solving question
Why does temperature decrease as we go to higher elevations.?
bcs we are going away from the source of heat. In this case the source of heat is Earth which heats the lower atmosphere by sensible heat and longwave radiation.
because we are going away from the source of heat. In this case the source of heat is Earth which heats the lower atmosphere by sensible heat and long wave radiation.
Possible practical application?
A change in height of 1km produces a pressure change of 100hpa~0.098692327atm
If there is a 2km difference & P1=1atm, then P2/P1~1.2 => 293.15*1.2^.286 -273.15~35.7 deg C
Questions:
1. Could there were a way to capture this change in heat...?
2. Could the difference between the cold and warm sides of a mountain that have "Chinook winds" be exploited...?
Is there vacuum suction pressure range any effective as sea level and high altitude sea level?
We are sorry. We didn't understand the question.
is the temperature at sea level =20' as a constant all over the world
+Shadi Alaghbari No, that would only be at a specific spot and the temperature is calculated relative to that. The temperature at sea level changes drastically all over the world.
sir how to answer this question:
what is the pressure in kPa, when the elevation is 1000m?
+shafrizul rahman elias
! ATM = 101,325 Pa = 101.325 kPa
Teacher, isn't the molar mass of nitrogen about 14 g/mol??
Nitrogen as a gas in the air is a diatomic molecule.
@@MichelvanBiezen thank you very much, sir
@@MichelvanBiezen I would also like to know if the hidrogen found in our sun also works as a diatomic molecule, because i've been using 0,001kg/mol as molar mass the whole time :D
The amount of nitrogen on the Sun is very small compared to hydrogen and nitrogen. (You meant to say 0.014 kg/mol, yes?) At the temperatures of the Sun, there are no molecular bonds and the electrons are stripped away.
@@MichelvanBiezen oh, thank you again:D. Actually i was talking about hydrogen, but i didnt type it correctly. My apologies
nicee
How would you solve for T
Take Ln on both sides then simplify for LnT with variables and finally take exponential after seperating T
sir. what is L unit c/m, K/m ?
The units are C/m or K/m. Either one is correct.
Some here might have seen how flat earthers make the claim that there cannot be a transition from atmosphere to "empty space" without some form of container.
It might be worth repeating this problem but say look at being a 100 miles up to show them how totally wrong they are, not that they would either understand this or believe it but others who argue against them could cite this and help those who might be on the fence in buying into that nonsense but who don't have enough physics background to refute their claims and thus might give them some credence as such to that false claim.
How can i buy this series?
Francisco. That is an interesting question. We just starting putting these videos on line a year ago, and we haven't productized them yet. So at this time they are not yet for sale, but they are free on TH-cam.
Michel van Biezen Maybe it would be a good plan just to set up a paypal donation form at least? I would be happy to contribute.
What is R here?
R is the gas constant. (Also known as the ideal gas constant).
How to get molar mass 28.5
Make a barometer holding one crore litres of💧💧💧 water💧💦 so it's become a great👍 source of🔌 energy⚡⚡⚡⚡ forever😁😁😁😁
That would be a great invention. 🙂
@@MichelvanBiezen make calculator for it 😁so we found out how much work out🏋🚴💪 we have to and⚡ how much power💪⚡ we found out🏋🚴💪 from this setup
@@anilkumarsharma8901 See my comment above. It's related!
Achilles heel
? 🙂