Boiling vs Evaporation (Definition, Examples, & Explanation)

An in-depth look at the differences and similarities between boiling and evaporation. The topic of boiling and evaporation come up frequently in introductory physical science courses. By comparing and contrasting the two ideas you'll develop a fuller understanding.
Note that this video focuses on the difference between boiling and evaporation of water (H2O).
--Boiling--
• Bubbles form throughout liquid.
• Takes place throughout the liquid.
• Faster process.
• Boils at a specific temp.(boiling point).
• Temperature remains constant.
• Thermal energy from external source.
--Evaporation--
• No bubbles.
• Takes place only on surface of liquid.
• Slower process.
• Occurs at any temperature.
• Temperature can fluctuate.
• Thermal energy from surroundings.
--Similarities--
• Both involve liquids changing to gases.
• Both need energy to take place.
• Both are physical changes.
--Learning Resources--
Introduction to Boiling: • What is boiling? An In...
Boiling & Vapor Pressure: • Vapor Pressure and Boi...
Boiling & Atmospheric Pressure: • Atmospheric Pressure a...
More chemistry help at www.Breslyn.org .

[@ashutoshsuman9473]

These kind of videos are helpful. Showing difference and similarity. Thanks

[@wbreslyn]

You are most welcome!

[@ashrafunnessa260]

I have been searching through the internet for a long time. And now I finally got the answer. Pity the school doesn't provide us with this basics. It would be so helpful if you upload a video on the difference between gas and vapor.

[@wbreslyn]

That would be an interesting video to do. I'll put it on my list! You might find this useful in terms of boiling (one of my best videos of all time): kzbin.info/www/bejne/d5iXnX-LjbCoia8

[@dmoqppsoysc]

still doesn`t explain the mechanism of why in evaporation lets say water at 40 C 1 atm, we know water boils at 100 C at 1 atm but why can evaporation converts the surface water molecules at only 40 C, does the presure drops at the surface?

[@tom_something]

This is very helpful. I'm not an expert, but something else comes to mind, which is kind of a branch of the last point, about the thermal energy coming from surroundings. I'm going to steer this toward evaporative cooling, which is how sweating helps us not poach our own muscles to death when doing an exertion-bean-thing. Because intuitively it seems so mysterious but it makes sense if you break it down. In any kind of a thing, but most interestingly for this discussion we'll say a liquid, there are molecules of the stuff all zipping about in different trajectories at different speeds. Temperature is kind of an "average" of the activity. There are things going faster and there are things going slower. Since it's an average, if the faster things leave the whole thing and never come back, the result is that the average measurement is a little slower. Slower is colder. That's evaporative cooling. If temperature is a head count, and the hotter heads leave because of evaporation, the final count is lower. A reduction in temperature.

[@wbreslyn]

Well stated! The Boltzmann Distribution provides a nice summary: chem.libretexts.org/Bookshelves/Physical_and_Theoretical_Chemistry_Textbook_Maps/Supplemental_Modules_(Physical_and_Theoretical_Chemistry)/Kinetics/03%3A_Rate_Laws/3.01%3A_Gas_Phase_Kinetics/3.1.02%3A_Maxwell-Boltzmann_Distributions

[@rojadaki]

Thank you for the explanations, helpful indeed! I would argue though that "surroundings" are an "external source", too.

[@samsamix20]

Am high school physical science teacher. I'm m going to use this. thanks

[@wbreslyn]

That is great to hear! You might find this useful as well, it's something my hs chem students helped me with: kzbin.info/aero/PLZR1BGWBaZ1xfggrpVpbXVFchALwL9qMh

[@lightcapmath2777]

Nice and clear. I see you are expanding your explanations in the area of Chemistry.:) Q: how long does it/ did it to make this video ? Peace David. :)

[@wbreslyn]

Thanks, David! I'm trying to do these types of videos more often. I'd say I spend an hour researching they types of questions and confusions people have about the topic and then about two hours to record and edit.

[@lightcapmath2777]

@@wbreslyn Wayne, Your dedication is much respected by me and am sure by others. Do you get many Q's from HS or college students to help with a Q as I sent some time ago?

[@wbreslyn]

It's interesting. I'd say about 80% of are "thanks for helping" type comment. Of the other 20% I'd say 15% are fairly simple questions and often I can direct them to a video I've already done. But the last 5% take some thought. In the past 24hr I've gotten 54 comments (I just counted) but it's a very slow time of the year!

[@lightcapmath2777]

@@wbreslyn Thank you for the break down Dr. B

[@-ZUKI-2011]

Thank you man! I have an exam tomorrow and I was really worried

[@rsrinc378]

this video helped with my term exam. thanks

[@AminathMaayaa]

Mine too

[@thalialarkins288]

This really helped for my end of year exams as my science teacher wasa ill half the year!

[@wbreslyn]

Glad it helped!

[@judeelwalid]

Thank you so much for helping me, your explanation is very detailed.

[@wbreslyn]

Glad it was helpful!

[@mycatsrbetterthanu.]

Thank you so much Wayne I always watch your videos and I’m subscribed to your channel the videos you post are really helpful and help me understand things I learn in school

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You just gained a subscriber 🔥🔥🔥

[@thenewlifeindia2068]

You are the best teacher

[@wbreslyn]

Thank you!

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Thanks DR B....

[@wbreslyn]

My pleasure!

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[@wbreslyn]

Thanks so much!

[@alderamin1402]

I need this! Thanks

[@sauravhere...]

Like why vapor pressure needs to equal atmospheric pressure to boil? what is logic behind it?

[@shandon360]

Ok but boiling is a still just a more rapid form of evaporation right? So all boiling is evaporation but not all evaporation os boiling correct?

[@wbreslyn]

Yes, boiling is a rapid form of evaporation occurring at a specific temperature throughout the liquid, while evaporation happens more slowly at the surface and can occur at any temperature, so all boiling involves evaporation, but not all evaporation involves boiling.

[@mariumsiddiqui6949]

For differences what does the last two ones mean???

[@amitrakshe5773]

But in both condition molecules have to have same energy to get evaporated?

[@duty_boy]

Sir make video on the Reaction of Sodium hydroxide and acetic acid . Plz sir I wanna know about the products

[@wbreslyn]

Here you go! kzbin.info/www/bejne/h4vSZ6aGgrWaZ8U

[@hamzanaynay4539]

Thank you very much

[@wbreslyn]

You are welcome!

[@beigomaacademymathsclub5873]

Thank you, Dr B. Are you now researching?

[@wbreslyn]

I'm on a bit of a break right now. I did publish this paper recently, related to a method for studying students ideas about science concepts. pubs.rsc.org/en/content/articlelanding/2020/rp/c9rp00145j#!divAbstract Hopefully more soon!

[@beigomaacademymathsclub5873]

Great job, Dr. Have you done any research before that?

[@daliamohammad04]

Thank u Dr B 💛

[@wbreslyn]

My pleasure!

[@prshnt.11]

Good video

[@wbreslyn]

Thanks!

[@in-s-aan]

Sir please upload redox reaction

[@wbreslyn]

It's on my list. This is all I have right now: kzbin.info/www/bejne/gKvXdadqp9R0ock

[@in-s-aan]

@@wbreslyn thank you

[@davidwere85]

Thanks 👍😍😍

[@wbreslyn]

Welcome 😊

[@ns-cz5hw]

Great video

[@wbreslyn]

Thanks!

[@yasyasmarangoz3577]

Very good video!

[@wbreslyn]

Thank you very much!

[@Alexandre-xz6jm]

Clear thank you.

[@joeljoseph2598]

Awesome

[@wbreslyn]

Thanks!

[@jacobotou477]

Isn't sublimation how we get freeze-dried foods?

[@wbreslyn]

Yep, you got it! Usually done under a vacuum.

[@deeperloveforphysics9513]

Sir, how do you explain temperature drop while boiling in vacuum?

[@wbreslyn]

Evaporation is a cooling process. Lower pressure means increased rate of evap.

[@deeperloveforphysics9513]

@@wbreslyn I understand all this Sir, but why is temperature not constant during boiling in vacuum?

[@wbreslyn]

@@deeperloveforphysics9513 So when the water evaporates, the more energetic water molecules are leaving the liquid. That lowers the temperature of the water since the overall kinetic energy is lower. You might like this video: kzbin.info/www/bejne/d5iXnX-LjbCoia8

[@saripallisyamala1095]

Thnx sir

[@crunchworks7297]

Plz different between infrasonic and ultrasonic now today is my exam plllllz pllllz

[@yasyasmarangoz3577]

wtf today???

[@wbreslyn]

This is the best I can do right now: en.wikipedia.org/wiki/Ultrasound en.wikipedia.org/wiki/Infrasound All the best on your exam!

[@crunchworks7297]

thanks

[@yasyasmarangoz3577]

@@crunchworks7297 Man you're brave 😅

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only i need loud voice cause i dont hear well

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Can’t understand

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Khan academy?

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hello

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[@wbreslyn]

Hello!

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[@-ZUKI-2011]

Thank you man! I have an exam tomorrow and I was really worried