3 Perplexing Physics Problems

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Why does shaken soda explode? Does ice melt first in fresh or salt water?
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This video features experiments that have been shown to me by science teachers over the years. Does ice melt fast in salt water or fresh water was an experiment introduced to me at the Utah Science Teachers' conference. The ring of metal over a chain demo came from a teachers event in Florida. The idea shaking a carbonated drink increases pressure came from an email.
Special thanks to Petr Lebedev for building the pressure gauge.
Links to literature are below:
Victims of the pop bottle, by Ted Willhoft. New Scientist, 21 August 1986 p.28
Carbonation speculation
The Physics Teacher 30, 173 (1992); doi.org/10.1119/1.2343501
Agitation solution
The Physics Teacher 30, 325 (1992); doi.org/10.1119/1.2343556
Filmed by Cristian Carretero, Jordan Schnabel, Jonny Hyman, and Raquel Nuno
Music from epidemicsound.com "Seaweed" "Quietly Tense" "Mind Shift" "Observations"



20 Nov 2019




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Rekt Emm
Rekt Emm 56 dakika önce
That slo-mo footage was amazing!
Ed S
Ed S Saatler önce
With the salt water, does the salty water mixing with the fresh not have the same cooling effect as the first addition of salt to the fresh water?
Joshua Sudholt
Joshua Sudholt 2 saatler önce
Why ya gotta dis paper straws?
MechanicusTV 3 saatler önce
someone is going to have to explain why soda bottles become more rigid when you shake them up. i'm almost 99% sure that soda thing was a troll.
Alexandar Patsov
Alexandar Patsov 4 saatler önce
our chemistry teacher told us that the surface of the mentos is whats causing the "explosion" and not the minty flavor as i thought
HylanderSB 4 saatler önce
I had learned to tap a soda can before opening but it had never been explained why it works. Now I know.
James Loll
James Loll 5 saatler önce
Here's an odd physics fact. Noticed washing dishes and such at work. Take a container completely filled with water with a tight fitting lid that DOESN'T snap on, tip it lid comes off and water spills out. Now take the exact same container but flip it upside down in the water after you fill it. This parts usually a little hard pulling the container from the bottom up out of the water without touching the lid. What should happen do you think? Most would assume the very weight of the water would push the lid off and you get a splash. Realize the properties of water, it's extremely resistant to changing density so before that lid can come off, air first must be able to get in. Given the inflexible nature of water density it will hold the lid tight to the container despite it's weight on it and it's tight enough that air can't sneak in. The negative water pressure is great enough that it can support it's own weight. Bunch of other odd things you can do with water too. It's got some weird properties but if you think it through, their not so odd after all.
Ethan Slatter
Ethan Slatter 6 saatler önce
Bruh legit half the people cheated on the poll
Kinslayers0 6 saatler önce
Fly > Veritasium
Linlin WU
Linlin WU 7 saatler önce
Regarding to the melting ice experiment, I'd really like to see what happens if you physically stir the two solutions to make sure the convection current from the melting ice are the same in both cases. Would the result flip - the ice melting faster in the salt solution due to lower melting temperature?
Inferno Xen
Inferno Xen 11 saatler önce
Java Viper312
Java Viper312 15 saatler önce
When I press on a shaked soda and a non shaked soda the shaked soda seams to be harder to press on. So how does that not be a difference in pressure
MechanicusTV 2 saatler önce
pretty sure it's hard to compress the liquid, meaning when you first get a soda it's at bottling pressure of 3 atms. if you open it you let the gas escape depressurizing it if you then shake it up it releases the stored 3atms gas and repressurizes to close to the same pressure level. of course this is only possible so long as there is enough stored gas left in the soda.
4285kenni 16 saatler önce
But mentos trick does not work on normal coladrinks, only those that are sugar free. Mythbusters tested this.
Julio figo
Julio figo 17 saatler önce
Cool and fun! tks!
Alex Gideon
Alex Gideon 18 saatler önce
After 90 days of no fap 10:57
Toro Roro
Toro Roro 20 saatler önce
favorite physics teacher
Marius du Plessis
Marius du Plessis 21 saatler önce
damned interesting about the soda. I knew about tapping the bottle on the side when it fell for example and you wanted to open it, but not about the pressure. Dropped a bottle of soda yesterday and thought it might pop as it was a 450ml one.
Marius du Plessis
Marius du Plessis 21 saatler önce
@6:53 "Me from the future"
Call Me Perseverer1
Call Me Perseverer1 21 saatler önce
I think it's may not be a problem it's the solution. Keep it up! :)
Zed orda
Zed orda 22 saatler önce
5:26 But how did you get the fly to go through the ring is the real question?
Robert Lewis
Robert Lewis Gün önce
Heh, I had tehe right idea about the first solution. (The third was pretty much explained the moment I saw the slow-mo, though....)
Toby Wenman
Toby Wenman Gün önce
But when you shake a bottle of coke the bottle definitely gets harder/expands a little bit. I don't understand how the pressure couldn't go up.
Cheese Gün önce
Absolutely loved this. Thanks so much
Virgilio Greco Baptistella
All my life I have hated straws for apparently making soft drinks taste more bubbly than normal! Now it is confirmed, just compare, drinking from a cup and with a straw. When you drink directly from a cup's edge, the liquid only touches the edge of the cup, while using the straw the liquid flows through the entire body of the straw (more surface), creating that unpleasant gas (at least for me).
The Love Of Awesomesauce
I thought it said psychic so I was getting my third eyed ready.
Tasos Daris
Tasos Daris Gün önce
I'm not sure that we throw salt in the streets in order to melt the ice. I always thought that we threw it in order to prevent the melted snow (water) to freeze.
gotwoh3ll Gün önce
So why when i shake the bottle do i feel it get tighter
mwaura erick
mwaura erick Gün önce
Soda is harmful to your health
Joseph Johnson
Joseph Johnson Gün önce
Wouldn’t part of the ice cube explanation be freezing point depression? The salt depresses the freezing point of water which in turn means the salt water mixture can get colder, and that would lead to less heat transfer to the ice cube. Which means it would melt slower.
Dave Morgan
Dave Morgan Gün önce
Outstanding video! Loved it! Made me wonder though, can you tell me what the water is doing inside of a pressure cooker? I suspect after a time it is NOT boiling even though the water will be above its boiling point. Is there any way to confirm?
Roman KFM
Roman KFM Gün önce
I love this channel so much.
deflex Gün önce
Are the slomo sounds real?!
ccgsales Gün önce
Nucleation huh? So tapping a soda can lid before you open it really DOES help prevent overflow!
Mikkel Ulstrup
Mikkel Ulstrup 2 gün önce
Great video! Though you left me with one question: Why does the pressure increase in the soda bottle until 3 atmospheres but no further?
Harshit Jain
Harshit Jain 8 saatler önce
Becuase equilibrium was initially set a 3 atms. That's why pressure is specifically 3 atms
Te[NO 2 gün önce
To the Coke bottle Experiment, why is IT Not possible to compress the bottle after shaking If the presure ist the Same ?
Cassandra Thompson
Cassandra Thompson 2 gün önce
I'm no physicist, but I don't think that "no ammount of shaking..." is true. Wouldn't shaking it enough to increase the temperature also increase the preasure since we're adding heat to the system from all that kinetic flappin about?
John Riley
John Riley 2 gün önce
Between 4:16 and 4:29 (at 0.25x speed, of course), look to the left half of the chain to understand the phenomenon. This is because the beads on the right side bunch up to make it look like two interlocking parts of the chain to offer a distorted perspective. You'll waste a lot of time if you look to that side. Just FYI.
Sylvain 2 gün önce
Funny how much "simple" experiments can teach you a lot ! Thank you :)
GMMVNET 2 gün önce
All the people just watched the video and voted
Follow Media
Follow Media 2 gün önce
8:47 it's technically misleading to say it's under 1atm of gauge pressure upon uncapping, but rather only 4E-4 atm. because in this case only the partial pressure of CO2 in the atmosphere is relevant. opening a soda bottle into our atmosphere is as good as opening the bottle into outer space where the drink going flat from CO2 loss is concerned. you can confirm this by opening the bottle, recapping it, pumping atmopheric air into the headspace back to 3atm, then shaking the bottle. gauge will rise to 6atm despite the dissolved CO2 being only 3atm.
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