Henry's law | Respiratory system physiology | NCLEX-RN | Khan Academy

Explore the relationship between partial pressure of a gas and the concentration of the gas molecule within a liquid. Rishi is a pediatric infectious disease physician and works at Khan Academy. These videos do not provide medical advice and are for informational purposes only. The videos are not intended to be a substitute for professional medical advice, diagnosis or treatment. Always seek the advice of a qualified health provider with any questions you may have regarding a medical condition. Never disregard professional medical advice or delay in seeking it because of something you have read or seen in any Khan Academy video. Created by Rishi Desai.
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[@coolestsds]

If you're here for MCAT explanation, this might be confusing. He is talking about surface , but if you need to know solubility then use: S = kH•Pg at equilibrium, is the formula that is used for the exam. Solubility (of gas into the liq.) = (Henry's Law constant) • (Partial Pressure of gas)

[@Kevine-vy2th]

Damn thanks bro

[@remusomega]

NOTE: Rishi uses the wrong units for K constant. The units are ; therefore the expression is conc=K*P It is important to get this right, because in Fick's law of diffusion the "D" constant is Solubility/Sqrt(mw) If you learn it like this, it might screw you up. I don't know anyone who uses these units in Rishi's videos.

[@nelevi.15]

you're right

[@jerrylewison8654]

It might be confusing,the formula for Henry's law is usually given as "c = Kh × P" and you will see it written this way in various textbooks and places.The one used in this video measures the concentration in mole fraction( usually designated by "x" though it is represented generically as "c" in this video) x=mole of solute/total number of mole in solution, thus no units(mole cancel's mole). If we use this as the way of representing our concentraction instead of molarity(mole of solute/volume of solution in liters).The formula becomes x= P/Kh,or Kh= P/x where Kh is the Henry constant and is given in atmospheric pressure(atm). "x" is the concentration of dissolved solute(gas),not the undissolved gas particles.Checkout the Henry law wikipedia article("Values of Henry's law constants" section) to confirm, or see it's values for different gases.

[@crocketmeow]

Another way to express Henry's Law is C = PS --> P = C/S because KH is inversely proportional to solubility.

[@sarthakjumde3527]

In the textbook which i refer they have used the same formula... so with this one i support Mr. Khan

[@shahid1vio1love]

Great video! Made understanding Henry's Law easy. Thanks!

[@languageengineer8782]

this is my second video and it is great. Helps me a lot for my studies.

[@pivierone]

Excellent explanation. Thanks! Your work is very much appreciated.

[@rahmaghazali4343]

Hi, thank you so much for this explication. It helps me a lot. :) good luck for all student who study alone during the corona containment

[@crimsonazrael8024]

very good lesson man congratulations!

[@slstats7948]

Nice❤️🤗 From Sri Lanka 🇱🇰

[@TheUmQualquer]

Superb guys, really good work!

[@CHIPSTERO7]

A very concise explanation there. I think many people fretting over the supposed accumulation of anthropogenic CO2 in the atmosphere could learn a thing or two from Henry’s law. That CO2 is highly soluble and there exists significantly more in water than in the air, and given the CO2 in water and CO2 in air exist in equilibrium and this equilibrium is reached very fast (take a look at a carbonated drink) then the majority of CO2 we are putting in the atmosphere should be absorbed by the oceans.

[@kirstenwheeler4946]

CHIP this then causes acidification of our oceans 😔

[@cesarignaciobritodedios4566]

Hello to those who think that the equation presented by Mr. Khan is incorrect. There are several ways to represent the Henry Law equation (including P = KH * C). There are also different ways of presenting the dimensions of the KH constant, even it can also be dimensionless. Respectfully.

[@Ajumi-]

Thank you for this video! Haha my english & chemical knowlege is quite poor and i was able to understand both here. (you've done a good job ;)

[@sarthakjumde3527]

Kevin thats just a constant value... u can name it anything u want K' or Kh

[@alexandrenr]

new videos!! thank you, rishi!

[@kkarwoski]

Very well done explaining the material

[@jeffrobison6729]

Great video. I'd like to see a few example problems from you!

[@jdhfjs5369]

Heyy so solubility is the amount of solute that dissolves in the solvent for a unit of pressure and henrys law constant is the pressure (energy...force × length )required in that given volume of solvent to dissolve a unit of that solute

[@krishnadas5960]

Such a good explanation

[@sofiamorales6613]

Excellent!I'm not clear on the application of the formula of concentration = P / Kh If the original formula is Concentration = Pressure per Kh

[@ananthakrishnan9186]

you started from a jar and ended up in henrys law.....;) thnxxxxxx

[@chaoticyatan7115]

It helps, thanks for the help

[@SahandHooshmand]

veeerry good!

[@djsunji]

thanks for the very good explenation. just a question, is this the same for for example beer, you get the small bubbles rising up, is this because of the temperature rise?

[@kevsac94]

Umm in my textbook, Henry's law is written as c=kP not c=P/k. I'm not sure which one is correct, you or the textbook. Could you please clear this up?

[@courtneyadavis]

Thank you so much for this video! Really helped to clarify partial pressure and Henry's Law.

[@dherrera4409]

I love it!, thanks u so much!!

[@IamDivaChef]

Can you explain this in relation to diffusion of respiratory gases?

[@anchalgupta4009]

The main application of Henry's law in respiratory physiology is to predict how gasses will dissolve in the alveoli and bloodstream during gas exchange. The amount of oxygen that dissolves into the bloodstream is directly proportional to the partial pressure of oxygen in alveolar air.

[@MariaMartinez-mj1cz]

can you provide an actual respiratory example perhaps knocking some one's hypoxic drive?

[@santiagohenaosanchez3210]

¡Awesome video! Thanks a lot. ¿Does anyone know whats the software he's using as a "writing paper"?

[@rejowanaljahn8732]

Are these vedios helpful for 12th grade students ? Or these are for higher classes ?

[@starfruitandthings]

So the concentration is the amount of green molecules in the air?

[@greenery6624]

I believe there is a little problem with the formula of the law. Well, the one I see commonly is C=kh*P. The one you put on the video have a problem at the moment of doing a dimensional analisys. But, checking in other sources it is possible to find the formula in the way presented here.

[@KevYallKi]

uhhh.... Mr. Khan. if I am not mistaking I believe that the equation for the Henry's law is wrong. it should be 'concentration = P x K'.

[@vedant6633]

kevin kim no it is P= Kh * X

[@bottenz1707]

It's the Same thing just written differently

[@vedant6633]

Le NAP but it does change the meaning of the constant!

[@missdemon92]

I think the Henrys law is wrong, in my text book it says c = kP

[@happy543210]

+missdemon92 henrys law is a manipulation of the ideal gas law: pv=nrt ===> p=Mr ===> p/r=M ===> c=P/k your text book is WRONG!

[@missdemon92]

+happy543210 i think i read there are versions some people study this and that i am not sure tho why our profs didnt note that😂

[@苏浩锬]

Why there is no H2O molecule in the gas phase? I mean the partial pressure of the green molecule should be 50%times the total pressure minus the water vapor pressure.

[@tibormalinsky8751]

Why would anyone use mm of Hg for pressure nowadays?

[@georgebanzon6527]

I have the same problem as kevsac94. In my book the equation is c=kP not c=P/k. Can anybody explain this?

[@georgebanzon6527]

I see, thanks for clearing that up.

[@sadamhocinehocini2215]

P=K*X هل نستطيع كتابة ( x الكسر المولي)

[@jdhfjs5369]

Kh is proportional to pressure proportional to concentration proportional to solubility Kh is inversely proportional to concentration and solubility Pressure is inversely proportional to solubility?

[@JaneMichelleTv]

if partial pressure increases by adding more molecules of that gas, then.....I don't understand why people say there is the same amount of O2 in the air at high altitude as at sea level?? If the percent of O2 is the same...... Do people mean the percent of O2 in relationship to all other elements comprising atmosphere??? so their ratios are the same but there truly are less O2 molecules in the same amount of space because of pressure?? there is less O2 in a gallon of air at 30k feet than a gallon of air at sea level. AND gases also move along a concentration gradient to equilibrium (between alveoli and cappilaries?

[@leepatel1652]

I swear this is wrong. I thought c=k*P, anyone else or is it just me?

[@onikedagreat]

Got it wrong on UWorld because of this video... :'(

[@p.gamble6164]

not really clear

[@chetnagreesan8747]

What the heck does that mean 😂😂😂

[@madrijayakody7738]

this is wrong ! henry' s law = C/ P

[@acppachauri]

The formula is wrong

[@MohamedGamal-rv3cm]

very bad