3 Perplexing Physics Problems
10 video

Veritasium: 3 Perplexing Physics Problems


Published on: Wednesday, November 20, 2019

3 Perplexing Physics Problems

Why does shaken soda explode? Does ice melt first in fresh or salt water?
Thank you Squarespace for sponsoring this video. Go to https://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); https://doi.org/10.1119/1.2343501

Agitation solution
The Physics Teacher 30, 325 (1992); https://doi.org/10.1119/1.2343556

Filmed by Cristian Carretero, Jordan Schnabel, Jonny Hyman, and Raquel Nuno

Music from https://epidemicsound.com "Seaweed" "Quietly Tense" "Mind Shift" "Observations"

Source: https://youtu.be/K-Fc08X56R0

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  • Kushal Jain

    Kushal Jain

     9 hours ago

    For 2nd problem could have just used thermometers at different levels

  • T R D J

    T R D J

     16 hours ago

    ok the ring through the chain in slo-mo sounds like a transformer transforming and i love it

  • Clayton Thomas

    Clayton Thomas

     23 hours ago

    So how do scientists know abt the Big Bang theory and ik their has been evidence of it till this day but still and how,,,???????

  • Samir Trajano Feitosa

    Samir Trajano Feitosa

     1 days ago

    Spider-Man on the video

  • s vs

    s vs

     1 days ago

    So there is no problem when we have coke and mentos

  • KillerSugar


     1 days ago

    Is it a freshwater ice cube?

  • Leon Lukah

    Leon Lukah

     2 days ago

    5:07 even here I dont understand what is happening lol

  • Najwa Laylah

    Najwa Laylah

     2 days ago

    So glass and metal straws provide fewer nucleation sites than plastic straws?

    That could be another entire short video.

  • Najwa Laylah

    Najwa Laylah

     2 days ago

    I can attest that champagne and other sparkling wines are, indeed, non-equilibrium beverages.

  • bóbr dziki

    bóbr dziki

     3 days ago

    Great video!!!!

  • De-man


     4 days ago

    Screw the physics the slow mo sound is amazing

  • Diamond Bolt

    Diamond Bolt

     4 days ago

    Hm, the Ice one sort of made sense to me. I had actually chosen the right answer for it. I was kind of perplexed by the soda one and had to choose between equal pressure and more pressure, which I chose more pressure in the end. Since I didn't understand why the soda would push out like that if there wasn't more pressure, but at the same time, I recognized that it wouldn't make too much sense for the soda to increase in pressure. When it's a single solution, air probably wouldn't cause any kind of quick chemical reaction of sorts. And it's basically a closed environment that the soda is in. I guess I just sort of had to choose between perplexing choices and I chose the one that would be a clearer cause for the end scenario of the soda exploding out.

    The ice one just sort of made sense, since salt water is more dense than regular water, the ice cube would have a harder time circulating through the salt water. Salt water is sort of a better insulator than regular water.

  • Mrmcfeffers


     5 days ago

    Lmao all the people that changed their answers on the polls to the correct one

  • Noam Rothenberg

    Noam Rothenberg

     6 days ago

    I think that the reason that paper straws take out more CO2 than plastic ones, is that paper isn't as smooth as plastic, so they will create more nucleation bubbles.

  • Faladrin


     6 days ago

    paper straws! BaH! Steel straws are best.

  • Tome Rodrigo

    Tome Rodrigo

     1 weeks ago

    You can put soft paper tissue into the fizzy drink and it acts similar to mentos...therefore I can assume that paper straw will accelerate the same process but not that much ...

  • MrStrangeSensation


     1 weeks ago

    Fire that cameraman 🤣

  • Thank You

    Thank You

     1 weeks ago

    Im gonna use the ring thing to tell that its magic to my classmates, AHAHAH, i love taking advantages againts people, AHAHAHAH

  • White Stallion

    White Stallion

     1 weeks ago

    Someone once said washing ice helps keep soda from going flat in a cup. Is this true

  • Diego Gigena

    Diego Gigena

     1 weeks ago

    lies it was magic