He really understands the value of intuition when teaching hard to grasp concepts, that's why his material is the best. Cheers.
@MrThe1234guy
5 жыл бұрын
First law of thermodynamics- Never talk about thermodynamics.
@coimbralaw
Жыл бұрын
👎🏻
@iAnesxx
5 ай бұрын
is that a ******* ****** reference ?
@janakm4135
2 ай бұрын
@@iAnesxxdefinitely 😂
@eragon2121
9 жыл бұрын
U for internal energy. The way I remember that is internal does not start with a U.
@kdogallyall
8 жыл бұрын
+eragon2121 I read this before I got to it in the video and was so confused
@blackswan9645
7 жыл бұрын
eragon2121 sodium starts with S but its NA in chemistry
@red_isopat
7 жыл бұрын
Black Swan its natrium in most languages
@dhruvverma6938
7 жыл бұрын
Neither does initial velocity start with u.
@rajibhalder1991
4 жыл бұрын
You are wrong, it's unternal energy.
@rajharsh3114
8 жыл бұрын
That Is like the first law of everything.
@urairaktaifoi2190
7 жыл бұрын
Raj Harsh คััา
@munirasuappavu6437
5 жыл бұрын
worse
@alexcourrier1918
11 жыл бұрын
My favorite part: "U for internal energy... The way I remember this is because 'Internal' does not begin with 'U' " lol
@kendo512
9 жыл бұрын
I've been watching these videos for close to 4 years now. I love how you can tell the age of his videos by the resolution of the writing. The newer ones are so much more crisp.
@wings4994
3 жыл бұрын
And your comment was made 6 years ago..
@kendo512
3 жыл бұрын
@@wings4994 thanks for the flash back
@kendo512
2 жыл бұрын
@just some guy tired of life my friend I’ve had this KZitem account since 2007
@jennyluvballet
7 жыл бұрын
Khan, you're the best! Literally life saver for my exam in 3 days.
@ivarbaratheon264
6 жыл бұрын
My exam in 2 days lol
@geico105
6 жыл бұрын
My exam is tomorrow lol
@RahulSharma-hk5yk
5 жыл бұрын
My exam passed LoL.
@ralphlaurenebol2835
5 жыл бұрын
My exam is today
@carlobadiola4994
4 жыл бұрын
My exam is an hour away
@tonyc6163
9 жыл бұрын
Khan post too many videos. Coolest people ever
@hadiramzani3790
10 жыл бұрын
The first part is law of Conservation of Energy...... Thermodynamics is about Heat in closed system. ΔU = Q - W could u pls tell more about the heat and adiabatic process.
@ashasalelkar7457
6 жыл бұрын
Adiabatic process is one where heat is neither transfered into or out of the system. Hence Q will be 0. Therefore W will be equal to -U. Now this is equal to -nCv(Ti-Tf). Cv is the specific heat at constant volume (Note - Cv is not only used for isochoric processes as it is thought to be by many. That is a mistake. Cv can be used for adiabatic and isothermal as well) . Now after substituting the expression for Cv. The FINAL eqn for W will be (PiVi-PfVf)/(gamma) - 1. So this just means that if work is done by a gas is positive, volume of the gas will increase and U will be more negative.
@meldjibs
14 жыл бұрын
@hybeerian I am a philosophy teacher in a school, and did this so my students could reply to your comment (we have been studying Ryle's 'myth of volitions'). You ask "can the energies of yore [sic] internal self exist in another form such as 'ghost' or spirit?" They have answered that question for you: that there is no such thing as an 'internal self' such as states of mind, they are in fact just ways of behaving, and thus physical like the 'carbon moleicles [sic]' that you recognise exist.
@NerdmasterChang
14 жыл бұрын
@hybeerian While there may be many different ways to store or to release energy, energy itself is equivalent. The reason that static electricity doesn't kill you is that there isn't enough current (amount of charge passing a given point at any one second) while in an Alternating Current or Direct Current Circuit there can be if there is not enough resistance. This does not mean that the energy itself is any different though. You can also essentially break down all forms of energy into...
@9futbolstar
11 жыл бұрын
This is so amazing...I cannot thank you enough KhanAcademy for all the helpful tutorials...It has expanded my knowledge in Chemistry and reduced my worries :) Thank You.
@VideoSouls
10 жыл бұрын
8:00 internal energy
@harvey2695
8 жыл бұрын
This is Amazing
@Neelam-_chaubey
2 жыл бұрын
How many jee aspirants here in 2022 or later
@holligirl426
12 жыл бұрын
I think Sal's favorite word is "intuitive" ;)
@shauryaverma2705
2 жыл бұрын
Love you khan academy
@JennyCheng0102
12 жыл бұрын
Be grateful that someone is willing to spend their time teaching you
@JCROD5
13 жыл бұрын
Awesome, good practice for remembering for a ME graduated some years ago!!!
@jamz3553
5 жыл бұрын
This is making alot of sense thanks you sal for your spend tim to save me from headaches at night😊
@nirunirmc3569
5 жыл бұрын
Khan this is very useful ......
@rocknrollette666
12 жыл бұрын
Personally, the writing helps; I watch videos where people just talk and it is not nearly as helpful as Khan. Plus, it creates the feeling of being in the classroom, which at the very least, gets me in the thinking mode that my house does not normally provide.
@jfrieze78
11 жыл бұрын
It can absolutely be applied to digestion. Calories are a unit of measure for heat. By determining the caloric intake, taking into account the efficiency of the human body in processing those calories, you can determine, fairly accurately, how much work the body would need to perform in order to "burn" the calories ingested.
@NerdmasterChang
14 жыл бұрын
@hybeerian Thanks for your reply. My argument is essentially that the information in our brains is not energy. It is the result of patterns in our neural network. I will also stress that there is no such thing as one kind of energy or another kind of energy. All energy is equivalent. The energy inside my computer is exactly the same as the energy inside my head. The only difference is in the arrangement of that energy.
@dracarys__xo509
7 жыл бұрын
does this guy just know everything. no matter what class im struggling with, he's got something up his sleeve lol
@carolinemarwan911
7 жыл бұрын
Thank you so much! Extremely helpful 👌🏻
@m92singh
12 жыл бұрын
I prefer the step by step actually, sticking on a whole lot of information on the screen can make the student confused and then not know how to follow the information.
@theabnationn
13 жыл бұрын
I understand you better than my lecturer.. thanks so much khan academy
@DrGregoryHouse100
13 жыл бұрын
Right after watching this i went outside and threw a rock in the air XD
@sakshiagarwal4821
8 жыл бұрын
Thankyou so much sir you are just amazing.
@nathanclark2780
9 жыл бұрын
So it was said that atoms don't really have rotational energy but molecules potentially do bc of sigma bonds that are able to rotate. However, atoms have atomic spin. Doesn't that translate into rotational energy? Was this an accidental omission or do atoms also have rotational energy? Much gratitude for your videos!
@kaydodgy
6 жыл бұрын
wow this was so easy to understand. If only one of my teachers came close to this.
@breakdancer100
12 жыл бұрын
The third law of thermodynamics is that if some yells "stop" or goes limp, taps out, the fight is over
@jfrieze78
11 жыл бұрын
Good question. The law of conservation of energy is precisely why perpetual motion is "impossible". For motion to be perpetual, there would need to be no negative forces acting on the object in motion. As he discusses in the video, friction is one of these negative forces. So, since the law of conservation of energy states that energy cannot be destroyed, it has to go somewhere, right? Well, in the case of friction, the energy is converted from kinetic energy to heat.
@baretings1
12 жыл бұрын
very very good guide, your not boring at all
@mehedihasan2294
Жыл бұрын
Love you sal Khan! You are the best teacher I ever had!
@ChirtyPoundsOfBoost
13 жыл бұрын
@kroflet There is, the ball is trasnferring its kinetic energy into thermal energy when its traveling against gravity as well. He made it seem like the force that accelerated the ball upwards was much greater then when the force of gravity acceled it downwards.
@zaireenzulaika5355
10 жыл бұрын
thanks for this vid! it's really help me in the exams!
@NerdmasterChang
14 жыл бұрын
@hybeerian Cont... potential and kinetic energy. These are different ways of storing energy, but that does not mean that the energy itself is different. "Fusion energy" as you stated, or the energy released by nuclear fusion is released from the mass defect of a nuclear reaction (a little mass is lost and a lot of energy is gained). "Thermal energy" or heat is the transference of kinetic energy from one substance to another. The energy is being stored in different ways, but it is all the same.
@smailwaltit38
9 жыл бұрын
thank you for this interesting video
@NerdmasterChang
14 жыл бұрын
@hybeerian Sorry for the long reply. A shadow is neither matter or energy, yet they clearly exist. Shadows contain information in that they paint a picture of the object blocking them. However, it would be incorrect to say that the information of the shadow exists as "energy". The previous analogy of the paper can be applied to patterns that your neurons make in your brain. I would say that there is information there, but the energy present in the cells is not it.
@lovemorenkomo732
3 жыл бұрын
Calculate AU for an endorthemic process in wc 20.6kj flows and where 13.7kj is done on the system
@Willxdiana
15 жыл бұрын
wow physics on chemistry! this helps since Im takng physics 1 with chem 2.
@phsycosk8er
11 жыл бұрын
Seriously guys, if you're going to complain about the way he's teaching then i suggest you find someone else, no ones forcing you to watch him specifically, I find his style very effective.
@IQ-rl2wx
4 жыл бұрын
Khan Academy helped me so much in my development
@pangasinanstinglessbee
12 жыл бұрын
Nice presentation! BUT, isn't that air resistance was always present when you threw the ball up and when the ball was falling down? A constant is present in opposite directions (meaning the factor of air resistance is cancelled out), so that the velocity going up should be the same as when going down.
@derrick8044
2 жыл бұрын
7:32 KE was transferred to air particles (rub) = heat 11:49, 12:44 internal energy (U) - "all the energy that is in a system"
@WinterCharmVT
13 жыл бұрын
@bleedinmagnification it radiates out into the surroundings, doing work to speed up other molecules, perhaps the molecules in the walls of the container...
@ChirtyPoundsOfBoost
13 жыл бұрын
@kroflet No the air resistance is the same, the density of air in this frame of reference is the same.
@gbonimabarmadia1482
5 жыл бұрын
this is the coolest video i have ever seen....I love Khan Academy
@redrodbert
4 жыл бұрын
It’s always U = Q + W . The sign conventions of W differs depends whether ur class is chemistry, physics, or engineering.
@SuperSuadad
9 жыл бұрын
Thank you khan, you are the man!
@SpaceTrooper50
12 жыл бұрын
Possible in Earth because kinetic energy can be use to "defy gravity" in order to gain potential energy. But a giant Wheel bigger than a Ferris Wheel is needed to make it happen. All it needs is the propulsion which will be the ball and a propulsion driver.
@URmyAM
12 жыл бұрын
Thanks, Very good video and good refresher.....
@wecantsee
13 жыл бұрын
@politicomdk potential energy is the energy of position, your catched ball does still have the p.e. it is clearly observed if you let it go again and it will accelerate down to earth enabling it to do work.
@anjxr82
14 жыл бұрын
i have question: A glass cleaned in 45celcius hot water and placed on the table bottom up. The room air at 20 celcius that was trapped in theglass gets heated up to 40 celcius and some of it leaks out so the net resulting pressure inside is 2 kPa above ambient pressure of 101kPa. Now the glass and the air inside cools down to room temperature. what is the pressure inside the glass?
@cynicalmanatee
13 жыл бұрын
@karozans yup, string theory is a perfectly reasonable theory that is fully able to explain everything. however it prove to be near impossible to prove. so in the current state of technological advances, conservation of mass and energy is still the dominant theory
@sparkyin3d
Жыл бұрын
Best explanation ❤!
@bonthavenkatajayanth7365
8 жыл бұрын
When the ball is in motion the mass also changes. E=MCsquare Energy increased so to balance it mass shound increase as C which is speed of light in vacuum is constant.
@The112Windows
8 жыл бұрын
? Energy did not "increase".
@ZnNlove
7 жыл бұрын
U might be onto something, my balls increase in size to compensate for the increased energy while jiggling in a horizontal motion.
@auroralevi2834
Ай бұрын
In what order should i watch all of the thermodynamics content so i can understand the full concept
@smailwaltit38
9 жыл бұрын
very few teachers uses this concrete method,,, talented
@masterstghm
12 жыл бұрын
I happen to like seeing it written out like a professor with a chalkboard. He could've just not made anything, and it's free.
@DanEMO592
11 жыл бұрын
Yea. You can watch the videos at 2x the speed like I do! :D It saves so much time when I am watching lectures or learning things on youtube!
@sameerncce
12 жыл бұрын
great video....thank you so much god bless u.
@combatfear4
12 жыл бұрын
Actually he does! He talks about one of the three principles that compose the First law of thermodynamics. More specifically, this law is called The law of conservation of energy.
@saeedkhanazam
11 жыл бұрын
very clear , well done
@antonytolstunov7513
11 жыл бұрын
Incredibly helpfull
@sethuhlophe3983
3 жыл бұрын
If energy or matter cannot be created nor destroyed can you explain quantum fluctuations where particles pop in and out of existence and completely obliterate each other? I’m new to this topic
@brianoc10
14 жыл бұрын
You're better than my physics lecturers ANY day
@1800ghostdance
14 жыл бұрын
very helpful
@01rai01
13 жыл бұрын
@ShamiranIvanof good point, if only the rest of the people had the knowledge or the understanding,
@NerdmasterChang
14 жыл бұрын
@hybeerian The 1st law of thermodynamics only applies to energy, and not information. Therefore, the information content of your brain is not guaranteed to survive your death. Also, the energy in your neural impulses is constantly converted to other forms and does not stay in your body until death. This is why your brain constantly needs more energy, and it receives it from ATP. The energy in your brain today, is different than the energy of your brain yesterday.
@jfrieze78
11 жыл бұрын
And, when the energy is converted from kinetic to heat, the object decelerates. The only way an object could move perpetually would be if the object was in an "ideal" system void of any forces outside of the object's system.
@SpaceTrooper50
12 жыл бұрын
Mechanical energy cannot be transfer to electrical energy without "magnetic field" This was never explained to me when I was in school. For example wind generator use PM magnet and hydro electric turbine because of this reason. PM magnet provides unlimited amount of electron at any given time when use to convert mechanical energy to electrical energy. Therefor energy can be created because this process of conversion can only be sustained by electricity. "Magnet/energy can be created."
@streetsNY
14 жыл бұрын
Thanks
@claz75
14 жыл бұрын
this is a very interesting video and very informative!
@midgeamoo
13 жыл бұрын
@Theoneandonly5811 The net sum of energy in the universe is 0 if you add the negatives and the positives. Therefore energy can come from 0, you just need the same amount of negative energy as positive energy.
@EclipZeMuzik
6 жыл бұрын
dude you're amazing i love this!
@demiurge8480
7 жыл бұрын
"no Mr first law of thermodynamics '' this should be a line in a Neil Gaiman book
@NerdmasterChang
14 жыл бұрын
@hybeerian Thanks for your reply. Technically matter and energy are different forms of the same thing, but essentially I see your point. However, I would not so readily classify everything as either of those. Information fits into a category I like to call patterns, which our brains love to identify. For example, if you were to print this page out, there would be information on it. Now you could add up the energy in the ink of the text, but I would not say that this energy "is" the information.
@fuckkokoo
13 жыл бұрын
mind blowing explanation of U= Q plus or minus W
@wprandall2452
6 жыл бұрын
If energy cannot be created, then it must have existed forever. But if it did, it would have to go back into the infinite beginning of time, which is not in reality. Time does not begin in a moment of time, but in infinity. What would be before it? No time, but no time doesn't continue, so time would replace no time. Only the abstract concepts, such as love, hate, math, geometry, truth, etc. exist there. If you tried to find their beginning, they would be there no matter how far you go back. Only at infinity would you find their source, but not energy; it is generated in a moment of time. Energy has to come from a created source in real time-space.
@IAM-ku8vx
5 жыл бұрын
How do you define time?Also does time exist at all?
@IAM-ku8vx
5 жыл бұрын
Time is a measure of change right?
@tenseman08
11 жыл бұрын
took that straight out of my head dude haha
@bashirahmadnajar6901
6 жыл бұрын
Vary super cool & good topics
@عليخلفطاهر
2 жыл бұрын
Thanks 😌
@DementedPony
11 жыл бұрын
Never argue with an idiot, they'll bring you down to their level and beat you with experience.
@crystalbramhill5277
3 жыл бұрын
If you had a tool to help you learn and be successful/pass thermo, what would you need in the tool? What issues/challenges did you experience taking thermo? What do you do when you are "stuck" and how do you get unstuck? If you have disabilities, what are accessibility needs to utilize an online tool? Why is thermo a difficult coarse?
@braxtonp.3991
6 жыл бұрын
WHY do we have to learn this in med school...hate my prof lmao. Ty buddy
@magmasceptre
12 жыл бұрын
That's why i like his channel!
@abelurbina2003
5 жыл бұрын
Hello Sir, When I computed the work done in pool (billiard) the white mother ball break the 15ball. The work brought OUT is more than the work brought IN. Let’s try to compute. F = 30lbs (White Mother Ball); D = 3ft (From the white mother ball to the first ball to strike) SOLVE FOR ENERGY IN W = F X D; W = 30lbs x 3ft = @t. ENERGY IN SOLVE FOR ENERGY OUT First two ball extreme corner of the billiard ball 2 out of 15 ball W = F X D; W = 30lbs x 3ft = @t X 2ball = @t. The remaining ball (13pcs ball) can produce more than @t. The computation shows that the output work done is higher than the input work done so the theory of conservation of energy is misconception. Appreciated for your reply Thank you. Abel Urbina
@bipinghimire9547
4 жыл бұрын
Difference in velocity might be one of the reasons for less Kinetic Energy.
@Kjgairborne
8 жыл бұрын
Thank you so much
@randygeen5621
4 жыл бұрын
So of energy can't be created or destroyed. How is it possible that subatomic particals can be created in a vacuum, even though it is for a milisecond or less?
@DJDunsie
12 жыл бұрын
That's basically what happens at school on white boards anyway. It is actually useful as it gives time for the brain to reflect on the words being said.
@rogerg4916
2 жыл бұрын
Is the amount of energy that goes into the production of a hydrogen bomb equal to the amount of energy released when the bomb is detonated?
@yusufalmestiri6821
11 жыл бұрын
very good
@69houyt
11 жыл бұрын
Then go watch one of his more advanced videos then. His lessons are designed for those with no background in the field, thus why he explains the fundamentals slowly. You know, that almost makes sense.
@justincollinns
14 жыл бұрын
@MerkaMage check out Heisenberg uncertainty principle when it comes to quantum mechanics.
@1Shatter1
12 жыл бұрын
Much better than a college lecture though. And it's free, and he does a good job to make sure you understand it, etc....Yeah there really is no reason for you to complain other than being a brat.
@aurieleification
11 жыл бұрын
The First Law of Thermodynamics is an application of the Law of Conservation of Energy. Meaning that the internal energy of the system is equal to the heat/work done to the system. Reference: "Chemistry" by Silberberg, 5th Ed., McGraw Hill
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