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3 Perplexing Physics Problems

Veritasium
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Why does shaken soda explode? Does ice melt first in fresh or salt water?
Thank you Squarespace for sponsoring this video. Go to squarespace.com to save 10% off your first purchase of a website or domain using code: VERITASIUM
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"

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20 Nov 2019

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Daha sonra izle
YORUMLAR 80
TJtheWonderChild
TJtheWonderChild 3 saatler önce
Thumbs down for paper straw hate - save the environment!
Proud Zionist
Proud Zionist 3 saatler önce
It's 1am, and I am FASCINATED! I can't stop watching these shows. Work tomorrow is going to be a challenge.
Desoda Dunham
Desoda Dunham 10 saatler önce
They got rid of the pole
lio mei
lio mei Gün önce
아 그래서 콜라 떨어뜨려서 터질 것 같을 때 뚜껑을 툭툭 치는구나
Be Rainbowed
Be Rainbowed 2 gün önce
Because of the insulating nature the ironic insulating nature ironic due to electrical conductivity The Saltwater actually insulates the Ice Cube from other aspects of the liquid touching it thus the local saltwater stays cool enough for the Ice Cube to remain ice and if it were salt dry it would be a much faster melt
Be Rainbowed
Be Rainbowed 2 gün önce
When you shake a pressurized bottle you ADD more compressed gas evenly within the liquid, hence opening it the tiny bubbles within the fluid, newly, enlarge with the pressure differential, hence simply under slo mo youll see my correctness
Adam Battiste
Adam Battiste 2 gün önce
That fly tho at 5.22 got sum skills
15acreflyer
15acreflyer 2 gün önce
what would happen if there was no head space in the pop bottle
foxhunter 137
foxhunter 137 2 gün önce
Is that the real sound of the slomo?
James Benton Ticer
James Benton Ticer 2 gün önce
That is one beautiful tree behind you.
MuCefoca
MuCefoca 3 gün önce
The whole thing was actually an advertisement for plastic straws.
Joshua Binion
Joshua Binion 4 gün önce
So that is why fish tanks have bubble makers
Nikolay Galkin
Nikolay Galkin 4 gün önce
Good video, thanks! And how do you explain the effect, when you take a rough surface from a matchbox, burn it, take a cinder on your fingers, wipe it and smoke goes! and fingers glow in the dark.
Environmental Chemist
How about this possibility? The salt water mix would be about 6% denser than freshwater. This means that the ice cube would float *higher* in the salt water, exposing more of it to the air, and less to the water. Water is a *much better* conductor of heat than air, so an ice cube floating higher in the water would absorb less heat and therefore melt more slowly.
Environmental Chemist
Hey - another thought. The *heat capacity* of water decreases as salt is added (ions in solution 'tie up' the water molecules, reducing the modes of vibration that can absorb heat). A tablespoon of salt in a glass of water would lower the heat capacity of the solution by about 10% (from 4.2 J/g/K to 3.8 J/g/K). The ice cube would therefore lower the temperature of the salt water *faster* than the pure water. As heat flow is proportional to the temperature difference between the ice cube and the liquid, the (colder) salt water would result in a slower heat flux than the (warmer) fresh water, so the ice cube would melt slower in the salt water than the fresh water. It's hard to tell whether it is the 'ponding' of the cold meltwater on the salt water (as explained in this video) or the lowered heat capacity that is responsible for the slower melting. One way to test would be to repeat the experiment but stirring both solutions to mix the cold meltwater throughout the glass. I might try this with one of my classes...
Mohammed Aimann Shaik
5:25 you can see an insect flying through the ring lmao
Kwincie Godfrey
Kwincie Godfrey 5 gün önce
I think the only reason I hot the second question right is because I live where there is rarely salt on the road so i just didn't think about it
Julius Filippou
Julius Filippou 6 gün önce
Even i could see that it would have have the same pressute
AJ GaMeR
AJ GaMeR 6 gün önce
'I hope you hav made your decision and registered in the poll right here☝️' Well who all did rewind the video to poll, hit a like.
Idreesi Bhai
Idreesi Bhai 7 gün önce
5:28 a gimnastic fly flew through the ring...
Allan Maina
Allan Maina 7 gün önce
I think i saw the ice in salty water melted faster......
Daniel Pedersen
Daniel Pedersen 8 gün önce
@veritasium you can mix up some salt-water food coloring, or add some food coloring to some of the salt water, and then when you add it to the salt water solution it will be at the same density
Anderson Welch
Anderson Welch 8 gün önce
If mentos make the soda "explode" due to the nucleation created by the rough surface, will the same thing happen if you replace the mentos with a different object?
MainlyHuman
MainlyHuman 8 gün önce
The bottle problem is similar to the cause of boiler explosions. A big steam boiler can contain several tons of liquid water, superheated to 300 degrees or higher. That water is kept in a liquid state by the high pressure inside the sealed vessel, but if the boiler fails due to metal fatigue or poor maintenance the pressure will be released. Then all that water boils in a fraction of a second resulting in a huge release of kinetic energy.
Hans Winkler
Hans Winkler 10 gün önce
If you are not used to drinking staws made from paper and dislike them, try Makkaroni as an alternative to plastic.
bcragar
bcragar 10 gün önce
Perplexing test : equivalence principle , objects in free fall are equivalent to floating in free space in their frame . So does an electron in free-fall radiate light because it is accelerating , accelerating charges radiate light, or does it not radiate
The Geeky Gamers
The Geeky Gamers 10 gün önce
Who else was watching that fly at 5:27? ;)
david nisbet
david nisbet 10 gün önce
Who else saw the fly on his hand fly through the loop of the chain when he dropped it 5:26
Kevin Manoj
Kevin Manoj 11 gün önce
why ice is white in color and why ice floats on water ? Please make a video on that.
Redskeleton
Redskeleton 12 gün önce
Is that why my root beer float gets so fizzy?
Federico Olivares
Federico Olivares 12 gün önce
The ring one is interesting as it ends up in a girth hitch and a kinda similar situation can happen while rapelling dwn a figure 8 where the rope slips and something similar happens
ExploringAmazingStuff
ExploringAmazingStuff 12 gün önce
still its amazing!!!
ExploringAmazingStuff
ExploringAmazingStuff 12 gün önce
3rd one is not perplexing right
Mnsoor
Mnsoor 12 gün önce
There is no pole
Quackers
Quackers 12 gün önce
5:23 Did he not notice this Fly on his hand that then flies through the ring in slo motion ? :o
Anita Toijam
Anita Toijam 13 gün önce
Why candl
Anita Toijam
Anita Toijam 13 gün önce
Why helicopter stay still when take off.
Eugene Francisco
Eugene Francisco 14 gün önce
Does that mean a bottle of soda in a pressure chamber of 3 atmospheres would not fizz?
Ruthwik Kolanu
Ruthwik Kolanu 14 gün önce
Paper straws are made up of paper pulp and paper pulp has air spaces in them which act as nucleation sites and thus draws air from carbonated drink and hence we experience fizz.
Artexerxes101
Artexerxes101 14 gün önce
The other two physics experiments were filmed at my old dorm. I wonder how he got access to it if he's not a student.
Robert Barnes
Robert Barnes 15 gün önce
The most perplexing question: why do you count down to every trivial action, like dropping ice cubes into water, or dropping objects from heights?
Eddie Ruddock
Eddie Ruddock 15 gün önce
11:25 Exactly the face and walkaway my girlfriend does when I "equalise the pressure" ;)
Alexander Wilson
Alexander Wilson 15 gün önce
Where that poll at.
Bankai OP
Bankai OP 15 gün önce
We dont put salt on the road to make ice melt faster, we put it there to prevent it from forming
Tom Ben-Arye
Tom Ben-Arye 16 gün önce
If you release a mentos inside a closed soda bottle, the pressure wouldn't increase?
ActualMoth
ActualMoth 14 gün önce
No, it just releases the bubbles in the soda the same as shaking it
Ryan Miguel Concepcion
Does anyone else not see the poll
KeyboardWarrior
KeyboardWarrior 18 gün önce
Nucleation sites are the reason that if you look at some soda or champagne, the bubbles spawn from the exact same point, because each little bubble is spawned because of the last, so you have a little chain that forms
Ravi Yadav
Ravi Yadav 18 gün önce
One of the best person to explain science ❤️
Juman Patowary
Juman Patowary 18 gün önce
That's the way to analyze and observe physical phenomenon. Liked this video very much
Jask Huma
Jask Huma 18 gün önce
Make a prediction right here Me: Trying to find the little icon
Eboss NZ
Eboss NZ 18 gün önce
The salt water was simple to why. Not sure that come close to complex
Eboss NZ
Eboss NZ 12 gün önce
@Jeremy Williams sure was
Jeremy Williams
Jeremy Williams 13 gün önce
It never claimed to be complex. All of these were simple
Jeremy Williams
Jeremy Williams 13 gün önce
So?
Sue Foote
Sue Foote 19 gün önce
Could the ice melting also be due to the fact that where there is salt water will flow so the ice dissolves faster due to the salt attraction
Krix Loaf
Krix Loaf 19 gün önce
What sorcery is this???
Rahul Bevinagidad
Rahul Bevinagidad 19 gün önce
I went to grocery store & asked for NON - EQUILIBRIUM BEVERAGE, the lady at the counter gave me "What Alien is this" Look 🙄
StarliskJanova
StarliskJanova 19 gün önce
Hmm ... But I did tried a couple times when I was small, I did notice when I holding a bottle, before shaking I can squeeze the bottle with no issue, and after I shake it the bottle turns harder to squeeze :\ What caused this ?
___DemonZ___
___DemonZ___ 20 gün önce
Ok yes I love voting on imaginary polls :)
Ned Bainbridge
Ned Bainbridge 20 gün önce
I always thought drinking soda out of a paper star made it taste bubbly
Anthony P
Anthony P 20 gün önce
Did you guys see that turbulent flow at 10:30 ... so much more awesome than laminar flow
Omerduse Gaming
Omerduse Gaming 20 gün önce
Walmart Elon musk.
Cloaked
Cloaked 21 gün önce
The poll didn't show up for me so imma comment it, I feel like the pressure will increase
M.H. KÜNTUĞ
M.H. KÜNTUĞ 21 gün önce
For a moment I was so afraid, thought the ring is not going to fall at first. Edit It didn't fall, I'm afraid now.
Natalija Djokic
Natalija Djokic 21 gün önce
... there's no pole?
Fahed Sebai
Fahed Sebai 21 gün önce
THERES NO POLL
Rinkatsi TV
Rinkatsi TV 21 gün önce
Theres no poll
Karen Jean Diez
Karen Jean Diez 21 gün önce
why salt put into salts by the way..? can someone enlighten me its still hazy
Karen Jean Diez
Karen Jean Diez 21 gün önce
How about a stone but into soda?.....
Sacha Baptista
Sacha Baptista 21 gün önce
So JD's 3-tap technic really works?
Tickleshits
Tickleshits 22 gün önce
i have a perplexing science problem: where do my socks go when i do the laundry?
Schniedelwutz
Schniedelwutz 22 gün önce
0:04 me when I didn't nut for 24 hours
Sandy Lloyd
Sandy Lloyd 22 gün önce
That laugh at 5 seconds was the fakest thing I have ever heard. I have been picking up a lot of forced enthusiasm on your channel lately. Do something you actually enjoy if this kind of stuff is making you hate life.
DeAndre Thomas
DeAndre Thomas 22 gün önce
5:25 the bug flies through the ring
DeAndre Thomas
DeAndre Thomas 22 gün önce
We stopped cleaning and started swiffering!
Lostlizzard707
Lostlizzard707 22 gün önce
The ring is super satisfying noise
pogchamp chris.
pogchamp chris. 22 gün önce
Forgot to put polls
pogchamp chris.
pogchamp chris. 21 gün önce
SCP- 096 o
SCP- 096
SCP- 096 21 gün önce
TRvid removed them
Gaming BattleField
Gaming BattleField 22 gün önce
Wouldn't the pressure in the bottle be less then 3 atmospheres of pressure because you let out quite a bit of pressure so the equilibrium would be lower then 3 atmosphere of pressure
Jay M
Jay M 22 gün önce
Subbed.
Jay M
Jay M 22 gün önce
5:21 There is a bug on his hand...
DarthDavid 227
DarthDavid 227 22 gün önce
I think your pressure gauge was broken, because shaking up a bottle increases the pressure you can feel the bottle becoming more stiff and you can’t squeeze it anymore meaning the increase in pressure is pushing against the bottle and it explodes when you open it, and the second time you showed the experiment you shook up the bottle and the pressure gauge went up so you probably used a good one
Susie Henderson
Susie Henderson 22 gün önce
Sorry but I still don't understand the ring and chain explanation 😔
Skallix
Skallix 22 gün önce
Can we all appreciate the fkin Glas in 9:00 looks awesome
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