For anyone wondering, he replied to a comment quite recently on his twitter asking why he does not make videos anymore. Quote - "I’d achieved my objective of covering all the basic material to give a good grounding in the subject." - Dr Bob Eagle
To all of those who enjoyed Dr. physicsA videos. I may suggest that everyone publish his comments and then end with "Big Thank you from "sate your your country". I want to show him how much he inspired all these people from different culture different languages different background but they agree to common thing, which is we loved physics and loved how he explain very difficult topics with simple and easy methodology. " . We need to show him how much we appreciate his efforts and how much he is really great person. "Dr Physics Big Thank you from Saudi Arabia
You are international tressure sir, i couldn't thank you well enough if i ever tried. These lectures of yours and all other videos should be saved and kept safe for all those who are curious about foundations of universe. I always wished to know all about these concepts when i was a little child. Yet you covered all the important bits on my mind from all those years. I feel very lucky i came across to your channel. Biggest thanks.
This type of video is how physics should be taught. If I miss something in the process, I can retrace back to where I failed off the train of thought. Kudos sir, I hope you continue making videos. :)
You haven' uploaded in more that 1 year and 5 months..... Plz come back DrPhysicsA. When you come back, can you do some advanced physics topics because you already covered a lot of A level stuff. Do topics like General and Special Relativity, Quantum Mechanics/Physics, Particle Physics, and Statistical Mechanics. Go into the calculus of those subjects instead of just touching a little on the subject. Tell us about the lagrangian. You can also teach some math like, chaos theory, calculus, differential equations, and much more. I know it's math, but you can teach math needed for physics. Just come back because a lot of us are eager to learn Physics from an amazing teacher. I hope you aren't dead.
This video is a rare thing. It goes in depth into stellar fusion AND it is concise, AND it is understandable! I challenge anyone to find a another video about this topic that does all that. Save your time...you won't. I have taught Astronomy for many years, and have learned from this video. Learned not just some about fusion, but some about how to teach in a way that is understandable and interesting, Thank you sir.
I realize this has nothing to do with the content in the video, but the way you greet us with that accent in the beginning, is nothing short of divinely cheery.
Thankyou drphysicsA are you still there? I am 18 and going to watch all your videos. Such a good content on RU-vid I found so many years later. Just wow
This is a most elegantly composed description on the subject. I don’t know much about physics or science, but this video made the subject accessible for me, and I feel gained a greater understanding. Thank you.
Doctor Physics A, I just wanted to say that I find myself routinely cycling back through your videos to gain important insight in every branch of physics. I truly appreciate the effort you put into this channel and just want to say that, IMHO, you have the rare gift of didactic prowess. Every video I watch of yours is a fun adventure in scientific learning, and I can't really say that for most other channels, Salut!
Wow. Fascinating tale of the birth of elements and suns and gold. DrPhysicsA well done again. Looking forward to the second part. Oh look! Spin Orbit Coupling is on the way.
1:31 I've been reading about attempts to make fusion reactors since 1970 so they have been at it for at least 50 years. The problem is sustaing the reaction as well as the problem of net energy (energy out minus energy in).
Thank you so much for your excelents videos. English is not my first lenguage but I have learned from them what I have never understood in my own lenguage. Thank you again, and...please come back.
Wonderful, lovely. About the 25th minute an expression of sympathy for the sun. And you thought you had problems...all that glitters is not gold. There are heavier metal heavyweights. Funny musings, glad you avoided the hole. Still want to squeeze that last fraction of a second when the S processed iron has tired the star from fusion and then..crunch, splat...oh look there goes uranium. Have a happy winter holiday.
God bless you! I have no word to explain your work! you are intelligent! I have shared your videos with my friends. I didn't get a person like you! Thank you, Thank you......
Absolutely fantastic videos Bob! Thank you for all the time you've put into them. It's been a big help while working on my MSc in Nuclear Engineering and now again for my PhD in Nuclear Physics. Do you have plans for more? thanks Jason
Drphysicsa where r u??? Please come back... Why u don't make videos anymore.... I'm a very very very very very big fan of ur teaching.. 😐😐 For 3years u not uploaded any videos.. 😟😢😢
Hello DrPhysicsA, I echo Al eslami's words below. GR, Higgs boson, Cosmology, Gravitational Waves...there are many exiting subjects that you could explain in more detail in a wonderful fashion like you did with the current videos. Even touching on the same subjects you have already, but we a bit more details......I check every week but nothing new. Hope everything is OK for you. You have a large audience eager to learn from you. Best wishes and looking forward for new and exciting videos. Cordiali Saluti. Luis
hey mate daz from austrialia. you should do more clips on mathematic notation and show us how calculus and string theory boggle is conveyed and the innate underlying maths concepts which are oversimplified and completely foreign to someone who is not in the know.. learnt alot from you. keep the clips coming. legend.
Anybody reading this comment, Please highlight this comment by liking... Message:Professor !! are you alright ? Why didn't you upload videos from 6 yrs?Please reply,Love from Punjab,India.
Why you stopped uploading videos?? Thank you for sharing your knowledge is such a simple way. Your videos are of great help. I hope everything is fine. God bless you. Wish, you come back soon.
Thank you for the physics lectures which are hugely beneficial for me. I need one clarification. Just before discussing big bang, you showed a reaction that involves fusion of a deuterium with a tritium producing helium 4 , a neutron and 17.6 mev of energy. Subsequently, you discussed fusion of two tritium atoms producing helium 4 , two protons and 18.4 mev of energy. My question is 1. Are both these reactions occurring simultaneously in the sun? If not why not? And if yes, which one is more predominant and why.
Hi Dr Physics, I know that for this kind of videos a good camera quality is not needed, and that you probably don't want to spend a lot of money in a good camera, but I have to say that your videos lose a lot of quality because of your maximum resolution (240p). Sometimes it's hard to perceive everything you write easily, and when talking about advanced physics we students need to have a clear idea of what you're saying, and seeing a blurry image does not help. Nowadays you can find 720p cameras for less than 50€ (40 pounds), and that change from 240p to 720p (considered HD) would be radical in your video and content quality. It's just an idea, I think that with your way of explaining things and with a good video quality you could become one of the leading physics channels. If anyone likes this idea please press the like button so that he can see this, I think that for a small amount of money we could all be benefited. Thanks, David
+david anton I don't think anyone owns a 240p camera these days. Theyre all at least 480p. I think the resolution is so low because the videos are so long. Lots of space costs lots of money for youtube, so compression is doing all the brlurification. I don't know the video file size limits for youtube, but I know you need to have several thousand subscribers to get more space. The compression is just cramming the whole video into the space available.
The way you explain the process makes it very easy to understand. This is easily one of my favorite RU-vid videos of late. I'm definitely gonna check out your other stuff.
Great video, as always. No big new things for me, but it is nice to remind of the things te one is aware of. The very end of the video was almost poetic. Reminded me of other great physicians and promoters of science. I guess DrPhysicsA does an equally good job. Hats off. Thans for these videos. There are many people out there who think they understand, but they lack the capacity to share their knowledge in a way like you do. Man I would love to have a beer with you and talk for an evening... About anything... Disclaimer: I know that my mental model of you that I made up in my head is most likely wrong. But realizing that is good in itself. Cheers. Thanks again. Do not think about these sentences too much if they did not make any sense to you. Keep making these great videos.All the best, Erik. Also I write this on a slovak keyboard which does not have the apostrpophe sign and I am lazy to switch it to english (also due to the QWERTY/QWERTZ difference), so that is the reason why I use the "long form" in my writing. I am perfectly comfortable with the short too. Different topic, I drifted away... Again... Sorry.... Loneliness leads to insanity. I am a nice example. Is it sad? Partially... Just make the best out of it (you, not me), be normal, not jerks like I am. Take me as a warning... Do non end up like me, seriously. Watch, learn and be glad you can make an actual use of this FREE knowledge. This is simply great. And be thankful that you are privileged to have internet access and understand english. Peace. (Now I am sad, I do not know why, I want to cry)...
So concise and understandable. All in 45 minutes. My brain cache is full, I will need a while to let my brain file it all in the right places. Thank you very much. :D
I LOVE this guy. He is really, really good. That part at the end about jewelry was a beautiful closing (tearfully so). Being a mathematically (and physics) literate non-scientist, this is really refreshing to see. I wish there were more like this on the internet. Thank you so much for doing this. Please make more ;-)
...and you get THA MOST, CATACLISMIC, GIGANTIC, MASSIVE EXPLOSIONNN LOLLLLLLLLLLL!!!!!!!!! You won the internet for today! Awesome video and perfect explanation!
This lecture was SO wonderful and filled me with joy and awe in its literally immense and universal scope - I felt I was watching the mystery of the recipe of the universe unfolding - it is awe inspiring how simple diagrams and mathematics no more complicated than 2+2=4 can effectively explain the simple mechanism that leads to the distribution of matter in the universe. This mechanism is as deep and simple and profound as evolution, but unfortunately doesn't have the status, fame or name that it deserves. Surely many Nobel Prizes were won on the read to this knowledge. Stunning that humanity in the 20th century worked all of this out. I loved how you even had an emotional ending, talking about gold jewelry - such a beautiful and personal ending to a cosmic story spanning 13.6 billions years, that isn't even finished and will repeat in many more cycles. And I presume that the reason that Li is so rare in the Universe is the same reason that Be and B are rare, because they just get reconsumed into He - Carbon is a special threshhold above which the larger elements are "safer". Lithium seems to be "the wonder element of the 2010s", hoped to solve our energy crisis (ignoring the wonderful graphene for a moment!)- and it's great here to understand its place in the Cosmic Alphabet Soup Recipe. I studied Astrophysics and Particle Physics in the late 80s and knew most of this stuff in bits and pieces but this was a sheer delight to see the whole story appear. I love your approach as a physicist - very pragramatic and not concerned with the rigors of maths - and deeply grounded in the reality and empiricity of nature. I think you should have included near the end briefly how Mercury to Uranium appeared - are they really rapid neutron absorption in the shock of a supernova or are they fusion of two lighter elements - i.e. the opposite of fission?
You are missed! You said you are in need on some inspiration...I hope Fluid Mechanics inspire you then, since in my point of view, a discussion of the Navier-Stokes equations would be a great addition to your channel. ;)
sir u r d best ,even better than mit opencourseware. I always wait for u r videos. If possible please explain some of hot topics like parallel univese in your mathematical style or other hot topics like whats wrong with gravity.
This great summary of nuclear fusion is great work, however, the sketches imply that a star shrinks when it runs out of hydrogen in its core. We know that outer layers do the opposite - they expand. The core shrinks all right but what makes the surrounding layers expand? Is it the higher 'fusion pressure' in the core or subsequent fusion in the other layers?
+Al eslami I'm still pondering what I might do next. I covered all the GCSE & A level elements for school studies and a fair bit of basic undergraduate material - in particular the area where I have the greater expertise. So its now a question of being inspired as to what to do next!
+DrPhysicsA Maybe just a quick video explaining why GR and quantum theory are incompatible with each other. What are the problems that physicists face (apart from a lack of experimental evidence of Gravitons) that makes the theories clash? This is something that doesn't seem to be very well explained on the internet and a short video would help a lot :)
+DrPhysicsA Can you do a series on string theory? I like your way of explaining things. And i hope that you may continue on some advanced physics concepts
+DrPhysicsA Maybe some advanced statistical physics? Having that right now as I'm being in the fifth semester Otherwise maybe solid body physics ? Just making suggestions ❤️
+DrPhysicsA Are you familiar with alternative nuclear fission reactor designs involving fluid fuel dissolved in a molten salt offering some very exciting breeding, safety, waste, efficiency, and fuel type advantages? You didn't mention it in the video I saw where you discussed the various reactor designs.
Dr Physics a very big thank from Brazil. I have only find your videos very recently, but they help me to understand the laws of nature, and as some one who wants to become a scientist i thank you a lot from that.
I love your videos, you thought me much more than all others together. I don't understand why supernova explodes, if the core collapses why the matter from outer layers doesn't continue and collapse further on it? I remember some video that there will be something like "explosion" of neutrinos that will push the matter into cosmos?
Love the videos, I'm planning on studying maths and physics in my spare time and I will definitely be using your physics lessons. How many videos will you continue to make? I noticed that your last video was a year ago. Will you make more?
How cool is the last information about the gold we have come from a supernova? How cool is that? thank you sir!!! Please keep going with your great lectures!
