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Andreas, so glad a fellow Greek would think Archimedes would have enjoyed this video! We agree with you on your comment about weighting and on our previous video we addressed that very topic. Check it out: How to Perfect your Weighting for Scuba Diving! (1st Basic Principle of Scuba Diving) th-cam.com/video/qSnWi189l8Y/w-d-xo.html
Brilliant explanation and video Lyell! Seriously, that's the most comprehensive and understandable explanation of how buoyancy works I've ever heard/seen. Nicely done! One of the things I love about diving is that every dive is an opportunity to practice and improve your skills, buoyancy being one of the primary ones. Once you've found that sweet spot in the water column it's like finding your place of zen. I get there every once in awhile. 🙂
9:00 When you drop weights you're not increasing Fb. In fact you are even decreasing Fb a little bit too, because your total volume, which is displacing water, decreases slightly when you drop the weights. However, by dropping weights Fw decreases a lot since lead is so dense (heavy), and Fb only decreases by a little, making you more positively buoyant.
Agreed, but the net effect of dropping weight, increases upward buoyant force. That's why we use lead weight, because they are low volume and therefore net effect on upward buoyant force is decreased.Thanks for your comment and watching!
@@everythingscuba I think you mean "Agreed, but the net effect of dropping weight, decreases downward buoyant force." which makes you go up. The force that is actually pushing you up is not increased by dropping weights, it's the force that is pushing you down that is reduced. Great video by the way! It was just this small detail that I got hang up on as an engineer that get stuck on details.
@@everythingscuba It does not increase the upward buoyant force. It increases the net force upwards by decreasing the downward force, but as Rogier pointed out the buoyant force itself actually decreases by a tiny amount. Also, when you talked about the aircraft carrier you said that "the volume of the water it displaces far outweighs its weight". the volume of the water it displaces is exactly equal to is its weight.
Lyell - your video was a pleasure to watch, listen and contemplate. Thank you for your thoughtfulness about buoyancy - evident by your use of Archimedes. Greetings from one who hopes to be diving Sharjah and Omani waters soon.
I found out the slightly hard way that changing you dry suit has a subtle affect too. I have a DUI CLX 450 that weighs 18 lbs. it’s a bit big for me since I lost weight since I was measured for it. With my tech rig, I have an 8lbs tail weight and it’s just right, maybe slightly negative. I bought a new Seaskin Nova as a backup. It weighs 12 lbs and fits me perfectly. I found on my last dive that, especially at the end, my 8lbs tail weight wasn’t keeping me down - decreased weight and volume combined to make me more buoyant. I am boosting to 10 lbs for the Seaskin..
Never dump your weight BUT also never say never. In the event of an emergency in which your options are get to the surface quickly or die because you’re out of air then a rapid ascent doesn’t look so bad. Also if you’re at the surface with an unconscious dive buddy that you have to swim back to a boat, you’re going to want to dump their weight to ease the burden of rescue.
Very nice video on all aspects overall. It might be only me, but thinking of buoyancy as difference on density of the object witht he surrounding is bit more clear to understand intuitively and explain. Archimedes prinsipile is correct but discribes more of the result of the difference in densitity in very specific cases (where water and air is involved), which involves more variables (volume, weight), and doesn't provide an intuition on how they are directly connected. If we concider the same problem just as differences of densities, we have the water with density X and the object with AVERAGE density W, then to achieve any mode of buoyancy we just need to change the average density of the object by changing volume and/or mass appropriately. It describes the exact same phenomena but from a different, maybe more in to depth, perspective.
I like your analysis! And while we agree with your overall proposition, trying to keep more complex and involved subject matter to a relatable and understandable rationale is alway one of our tenets on Everything Scuba. We will definitely be going deeper into the aspects of neutral buoyancy in the next video. Thanks for you insightful and well thought out comment! Thanks for watching!
@@fergieconvery1530 um no. Archimedes principle was in there somewhere and bringing on board the basics for newer divers to understand the ways to begin to control their buoyancy. But maybe you missed those parts too?
If you'd like to support our channel and help us continue to provide great TH-cam scuba content, consider visiting our "Merch" store and order some great Everything Scuba clothing or accessories at this link: (New items being added regularly):
everything-scuba-merch-store.creator-spring.com
Subscribe to Everything Scuba (If you're already subscribed, thanks! We appreciate your support!)
th-cam.com/channels/qkYj52oqx4kie11AMtdRDw.html
Excellent! 41 years of diving, with many instructors, and this is the best explanation and analogies I've heard. I'm stealing this as my own.
Greetings from Greece ! Archimedes would be proud of this !
I am an AOW diver with
Andreas, so glad a fellow Greek would think Archimedes would have enjoyed this video! We agree with you on your comment about weighting and on our previous video we addressed that very topic. Check it out:
How to Perfect your Weighting for Scuba Diving! (1st Basic Principle of Scuba Diving)
th-cam.com/video/qSnWi189l8Y/w-d-xo.html
Brilliant explanation and video Lyell! Seriously, that's the most comprehensive and understandable explanation of how buoyancy works I've ever heard/seen. Nicely done! One of the things I love about diving is that every dive is an opportunity to practice and improve your skills, buoyancy being one of the primary ones. Once you've found that sweet spot in the water column it's like finding your place of zen. I get there every once in awhile. 🙂
+John Ayres thank you so much for your praise! We try hard to make the complex easy to understand! Good to hear from you John!
9:00 When you drop weights you're not increasing Fb. In fact you are even decreasing Fb a little bit too, because your total volume, which is displacing water, decreases slightly when you drop the weights. However, by dropping weights Fw decreases a lot since lead is so dense (heavy), and Fb only decreases by a little, making you more positively buoyant.
Agreed, but the net effect of dropping weight, increases upward buoyant force. That's why we use lead weight, because they are low volume and therefore net effect on upward buoyant force is decreased.Thanks for your comment and watching!
@@everythingscuba I think you mean "Agreed, but the net effect of dropping weight, decreases downward buoyant force." which makes you go up.
The force that is actually pushing you up is not increased by dropping weights, it's the force that is pushing you down that is reduced.
Great video by the way! It was just this small detail that I got hang up on as an engineer that get stuck on details.
@@everythingscuba It does not increase the upward buoyant force. It increases the net force upwards by decreasing the downward force, but as Rogier pointed out the buoyant force itself actually decreases by a tiny amount.
Also, when you talked about the aircraft carrier you said that "the volume of the water it displaces far outweighs its weight". the volume of the water it displaces is exactly equal to is its weight.
Love the videos! When is the propulsion video coming out?
Lyell - your video was a pleasure to watch, listen and contemplate. Thank you for your thoughtfulness about buoyancy - evident by your use of Archimedes. Greetings from one who hopes to be diving Sharjah and Omani waters soon.
Good analogy, I am still working on it. Unfortunately not able to dive a lot to perfect it. Thank
I found out the slightly hard way that changing you dry suit has a subtle affect too. I have a DUI CLX 450 that weighs 18 lbs. it’s a bit big for me since I lost weight since I was measured for it. With my tech rig, I have an 8lbs tail weight and it’s just right, maybe slightly negative. I bought a new Seaskin Nova as a backup. It weighs 12 lbs and fits me perfectly. I found on my last dive that, especially at the end, my 8lbs tail weight wasn’t keeping me down - decreased weight and volume combined to make me more buoyant. I am boosting to 10 lbs for the Seaskin..
+Mike's Big Adventures thanks for your comments. Always enjoy hearing from you Mike!
@@everythingscuba Love your videos Lyell. Always good to see a new one
Nice demo
Link to next video
Will be released soon. Stay tuned.
I was told NEVER to dump weight... so why the conflict between instructors regarding this practice???
Never dump your weight BUT also never say never. In the event of an emergency in which your options are get to the surface quickly or die because you’re out of air then a rapid ascent doesn’t look so bad. Also if you’re at the surface with an unconscious dive buddy that you have to swim back to a boat, you’re going to want to dump their weight to ease the burden of rescue.
Very nice video on all aspects overall.
It might be only me, but thinking of buoyancy as difference on density of the object witht he surrounding is bit more clear to understand intuitively and explain. Archimedes prinsipile is correct but discribes more of the result of the difference in densitity in very specific cases (where water and air is involved), which involves more variables (volume, weight), and doesn't provide an intuition on how they are directly connected. If we concider the same problem just as differences of densities, we have the water with density X and the object with AVERAGE density W, then to achieve any mode of buoyancy we just need to change the average density of the object by changing volume and/or mass appropriately.
It describes the exact same phenomena but from a different, maybe more in to depth, perspective.
I like your analysis! And while we agree with your overall proposition, trying to keep more complex and involved subject matter to a relatable and understandable rationale is alway one of our tenets on Everything Scuba. We will definitely be going deeper into the aspects of neutral buoyancy in the next video. Thanks for you insightful and well thought out comment! Thanks for watching!
little question where did you get the Cousteau picture?, I see it online all the time but can't find it on the right size for printing
Art.com. Can order a variety of sizes and frames.
@@everythingscuba Thank you very much, will order my self a copy
👍
Great video but it’s Archimedes not Archimede’s by the way
why arent you talking about the fine tuning we know about the course controls, dear oh dear 15 mins wasted
Well you’ll learn all about that in the next video …..dear oh dear if you’d only paid attention.
@@everythingscuba So you spent 14 mins telling us how we can inflate our BCD :)
@@fergieconvery1530 um no. Archimedes principle was in there somewhere and bringing on board the basics for newer divers to understand the ways to begin to control their buoyancy. But maybe you missed those parts too?
@@everythingscuba my apologies, struggling to find the other video though :)
@@fergieconvery1530 hasn’t been released yet. That’s why it says “Video coming soon” at the end.
I'm sorry but I get nothing out of your videos. You do have lots of philosophical explanations but lack hands on real world explanations.
Thanks for your negative input.
Greit video😊 thanks for shearing this. Rune. Norway