Object Density Has NOTHING To Do With Buoyancy.

Contrary to what you might think, the density of an object has nothing to do with the buoyant force that acts upon it.

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[nonna_sof]

It would be a lot easier to just remind people that the buoyant force and net force acting on an object are not the same thing. Two fully submerged objects of the same volume in the same fluid will experience the same buoyant force regardless of their mass. The net force is the force exerted on an object by gravity, which is determined by its mass, minus the buoyant force acting on an object.

[HenrikDanielsson]

You forgot to account for the relative density of the observer. The denser flat earthers will still not understand how this works because they block all explanations from entering their skull. One of the best insulators known to man.

[cola]

if first I was like "WTF are you going on with?" but then I remembered that buoyancy is indeed a foce equal to weight of displaced fluid.

[Kualinar]

Buoyancy is a secondary force. It's the result of another force acting on an object and a fluid : Gravity. For all intent and purpose, gravity can be treated as a force.

[bobblum]

Ever since I remembered the American Egg Board commercials for "The Incredible Edible Egg", I think of them when I see the "This, is an Egg" clip from Anthony Riley. Do a quick YouTube search and I'm sure you'll find a few...

[mcharest]

I've learn about density in school but dinsity is new to me. Very interesting.

[sonargast]

technically it is still the density of "the object" that tries to counter the density of the water, but it is a bit tricky to say what "the object" is.
When you put the plate vertically into the water, "the object" is just the plate, and having a greater density than water, the plate sinks...
But when you put the plate horizontally (and upward!) onto the water, the little volume of air in the hollow shape of the plate has to be considered, too. Your water displacing object is (a) the plate with the size and mass of the plate plus (b) the little volume of air in the plate from the plate top to the water level - a bit of space and basically zero mass. The displacement is the result of both the plate and the air - the mass is basically the plate's mass as air is comparatively light, but the volume is the sum of the plate and the air pocket, the hollow (and air containing) shape of the plate contributes in a way you cannot neglect. Imagine (or do) the counter experiment and put the plate onto the water horizontally but downwards WITHOUT any air trapped beneath it. Your Plate will sink, demonstrating that the swimming is not due to the plate alone but due to the plate plus air displacing the water.
So it is the combined mass and combined volume, basically the average density of the whole construct (plate plus air), that has to be measured against the density of water.

[vianneyb.]

I love how you start your videos saying "Ahoy-hoy!". I discovered you recently so I'm a bit out of the loop for this, but it reminds me of Houshou Marine, the Japanese pirate vtuber.

[scott_meyer]

Once an object displaces fluid equal to it's weight, it stops sinking.

[ramkrishnajoshi]

"The dielectric of the volume manifests itself as toroidal field purturbation in the density field of the egg which in turn induces high order magnetic force in the buoyancy 3d vector, "

[ReinoGoo]

The mass of a floating object is equal to the mass of the fluid displaced by the object. Archimedes principle.

[Soundbrigade]

This is an egg …..😂😂😂😂😂 Gotta have that egg-shirt!

Remember when Mythbusters had lead fly off the ground - LEAD frocking heavy metal!!

[Snwar]

well the average density of titanic or your dinner plate and the air they enclose is lower than that of water.

[MaryAnnNytowl]

You're skipping right past the reason the plate floats, though. The volume of the object is the most relevant part when talking about floating.

A block of aluminum will sink. That same block of aluminum will make a boat that will float quite nicely. The block of aluminum has a very small volume. The aluminum boat and the air it contains has a larger volume, so it floats.

[arctic_haze]

Buoyancy is generally the difference in weight between an object and the fluid (gas or liquid) it is surrounded by. Because both have the same volume we can divide the force by the said volume and then buoyancy per volume is equal to the product of gravitational acceleration (because it is a gravity caused force) and the difference of *average* densities of the object and the fluid within a volume. So yes, Titanic is less dense than water as long as it has air inside.

[Hedning]

So: If buoyancy has to do with the volume of the submerged object and the volume of the submerged object has to do with its density then how can you say buoyancy has nothing to do with density? That's not how logic works. It may not in all cases, but in some.

Also if density had nothing to do with buoyancy then why is density referenced already in the second paragraph on the wikipedia page (and no, it is not exclusively talking about the density of the liquid)? If density of the object had nothing to do with buoyancy it should at most be mentioned in a section about misunderstandings.

Furthermore here's a quote from University of California: "The buoyancy of an object is proportional to the difference of the density of the object and the density of a liquid." 3 physical properties listed: 1 buoyancy, 2 density of object, 3 density of liquid. If density of the object had nothing to do with buoyancy then why is it used here?

Finally an experiment to measure the density of an object can be performed by hanging an object below a spring scale and reading it in air and again when submerged. Nothing else. The buoyant force is completely essential for this experiment to give an accurate measurement of its density. If buoyancy had nothing to do with density you should not be able to use it to measure density.

You said "nothing". It has _nothing_ to do with buoyancy. Then all the science sources should not mention the density of the object when talking about buoyancy and you should not be able to measure density using principles of buoyancy. That is what the word _nothing_ implies. Alpha decay is an example of something that has nothing to do with buoyancy, and you'll notice the difference between how often it is referenced when talking about buoyancy and how its equations cannot be used in anything related to buoyancy.

[pharynx]

at the uni my brother went to, the civil engineers would make a boat, entirely out of concrete, as a project.

[thelegendaryrcn]

the witch scene from "monty python and the holy grail" is the best explanation of bouyancy and relative density.

[VincenzOmaha]

I'm surprised I haven't heard anyone bring up submarines. Being a former submariner I can attest that the density of the boat does not change as it moves up and down in the ocean, air just displaces water in the ballast tanks. The volume remains the same but when the ballast tanks fill with water the boat becomes less buoyant. To surface, air displaces the water and the ship becomes more buoyant. Same volume, same mass, just variable parts of the boat filled with water. Essentially the same as floating a cup upside down and pumping air or water in to change the buoyancy.

[StevenMRSenior]

Archimedes explained buoyancy thousands of years ago. Eureka! Look it up