Pascal's Blaising Barrel - Exploding Glass Barrel with Water Pressure 

The best part of this video was keeping in the mistakes, and showing that science isn't always perfect before it goes into the textbooks.

Another way to think about pressure depending on only the height of the water is to go to the edge of a lake, dig a small hole, make a channel connecting the two that's only a few centimeters deep, and then try damming that channel with your hand. The force of the water you're trying to hold back will feel negligible, even though there's a massive amount of water on the lake's side.

This was the only video I found about the topic. Thanks!

Great demo! Honestly though, I think my favorite part was the bit about the technical challenges of this experiment - thank you so much for including that.

Fantastic experiment. That’s a real teacher right there.

That is so cool... I knew the physics of it, and understood that it should work, but it is still REALLY fascinating to see that thin tube of water breaking that big glass, purely because of the height of the water "column".

I love this professor. She's great and I can see how much fun it would be to learn in her class.

A really GOOD demonstration of a physical law/property. You can learn Pascal's law a hundred times, and even pass exams using it and its mathematical equations - but this short explanation followed by a pin-point "query to Mother Nature" with such a thin - even flexible tube, and so little extra water - will really do the job. People who watched this video will have the fact and physical law "nailed down" in their heads, part of their future intuition. I admit to have been surprised, despite my BSc. in physics (ok, from 40 years ago...) my Intuition had it that the AMOUNT of water (hence its weight) had to do with the hydrostatic pressure. I really needed that reminder of Pascal's law and its meaning. I learned something here. Thank you.

When you search the world for something that someone should have done long ago (and documented), but you find nothing... then you know you have got a gem. Cool video. I admire your perseverance.

I did a similar experiment the other direction. I dove into the deep end with the long pole we used to vacuum the pool. I put my hand over the tube so it wouldn't fill with water, then once at the bottom, I put my mouth on the end of the pole thinking it would work like a long snorkel. It almost sucked my lungs inside-out. Lol

Wow, this is amazing. I'm looking forward to the next videos!

Amazing, thanks so much for doing this and then sharing it with the world.

Awesome idea for a channel. Hands-on showing students how science really works. Thanks for sharing!!!

Great experiment and very well executed! You did a good job dealing with all the challenges.

Thanks for going to all of the trouble to make this demonstration! It's great to actually see a lesson, and not just learn it and accept it's probably true.

The only demonstration i could find online... Thank you!

I enjoy hearing her lectures and experiments, her voice is very pleasing to the ear.

An excellent demonstration!

I wish we'd had experiments like this when I was in high school (a long time ago). Seeing physics and mathematics in action really helps.

Incredible demo. Thank you for resurrecting that experiment.

It is interesting to consider that the pressure in the tube at the bottom is the same (approx) as the pressure that bursts the barrel, but the thin plastic tube can withstand it.

Excellent demonstration very well explained! Thank you very much for the effort! really appreciated!

Thank you so much for doing this experiment!

Congratulations. Very nice experiment. Specially because of what was not hidden under the rug. I will use it with my students here in Brazil. Thanks!

wow,looking forward for other videos as well

Super very nicely explained and demonstrated. This type of videos should be shown in schools.

i am listening to a radio program about Pascal right now and i wondered if this experiment was here.. i can't believe it! ..fantastic, thankyou for doing this 🙂 x

Great demo!

I'm really glad you had the foresight to dye the water in the tube. Notice that as soon as the vessel fails, it starts to fall, and the top of the vessel accelerates downwards at the expected 1 g. However, blue water immediately sprays in even faster than a simple 1 g acceleration from gravity could allow. This shows that the water has forces acting on it other than simple gravity- in particular, the spring-like elastic deformation of the tubing, and to some degree, the water itself (even though water is carelessly described as "incompressible", it does actually compress a very small amount). Without these forces, the top of the vessel and the blue water would have accelerated at the same rate and we would not have seen the blue puff.

A great teacher with intelligent ideas! Well done.

Now I know excitement is another word for science. Thank you doctor.

Thank you so much!! You're video really help me😀 Love your channel💕💕 keep making a new video

I've been using this video in my Physics with Calc college class for a few years. Now I'm going further and using it as a Canvas video quiz.

This demo is amazing

You are a great teacher and it would be so awesome if had more such amazing content of your channel.

Love this video. All good data is important. Especially observable surprises such as in take one. Fun fun.

It was demonstrated in my class and my student took it as well as a science experiment and fun. This is the great demonstration I have ever seen! Thanks to the authorities especially to the science teacher.

This is pretty amazing, thank you 😊

Brilliant video and demo.

You are such a great presenter of science!

I’ve never been so enthralled by an educational demonstration in my life

What about a slight alteration to the demonstration? Pre-fill the tube (above the mouth of the jar) and just raise it up to show how it's only the height that matters.

u did a lot of hard work, i didn't think this would be this hard

I am so proud of the team work

Every STEM teacher should start every lecture with this quote from Adam Savage of Mythbusters. "Failure is always an option"

Why didn't the hydrostatic pressure burst the tube near the bottom. If it was able to break the glass, shouldn't it have been able to burst the plastic tubing?

Nice demonstration of hydrostatic pressure. P= density x gravitational force x height I teach Physics to Anesthesiology students. That Hoover dam explanation was epic. I never realized that aspect. I learned something new today.

fun and explanatory, good job...

Wow! This is a great demo. I had known that only the hight is the determining parameter, but I had not viscerally internalized that fact. Never realized that the water pressure of a hose would suffice to generate the pressure to destroy a vessel. Welldone! Excellent visualization. Thank you!

Very Cool!! My physics teacher showed us this and it blew my socks off!!

Thanks for this video, I show this in my class.

Great video, thanks for sharing 👍

I don't know why this made me cry but thank you for this video. I couldn't find any other video about this specific experiment that Pascal did. Also, I am inspired that you are a woman in STEM.

Very very good, thank you!

What a great teacher!

That teacher is also breathtaking.

You are my hero! I've always wanted a video of this experiment but no matter how hard I've tried I could never find one. It is also interesting to hear that perhaps Blaise didn't actually perform the experiment. I prefer to think of that as sour grapes from people like me who couldn't do it themselves because of all the obstacles that would have to be overcome.

Ma'am you are amazing!!!! I wish I could have teacher like you.

My thumb up is for this teacher. Because she is awesome!

This is great!

Excellent demonstration!! That's how physics is to be taught👍

Great video

Greetings from India !! Excellent demonstration like never seen before !!! 😃 Really looking forward to view the upcoming videos. Dear madam, it would be really exciting to watch more such experiments on various concepts like surface tension, capillary rise, hydrostatic forces on bodies under water, buoyancy & what not !!! Regards ! 🙂

I wish I'd had teachers like her when I was in school; I might not have turned out to be such a failure 😅

This answered the question I asked when I was in grade school back in the 1950's. So cool to see this. Perhaps I should have done my homework in high school...

love that you can see the soapy water flowing into the bottle while the bottle is collapsing

Thanks a lot!

absolutely amazingg

I love it.. Pls explain other scientific laws in the same manner, as they were discovered first.. With less of modern tools and clutter, when you put it just as they were discovered, it becomes so intuitive and easy to understand... Thanks

Love the way you explained everything, I would like to be your student in my next life❣️❣️❣️

Really great

Wish I had had teachers like that who could Teach a lesson and keep ALL interested ...

One of the best Physics videos in you tube

You're a very very good teacher

Super cool.

Nice experiment. I told about Pascal experiment the last lesson and my students should tell me, if it is possible. I was thinking about that, how I could do the explose in my class, but I will prefer to show them your excellent video. :-)

Reminds me of watching Professor Julius Sumner Miller on TV, when I was a child. Good memories.

Best demonstration I have seen of this counterintuitive result. Clearly reality is more complex and stuff like a earthquakes will move the water in the lake. and will generate forces that are related to the mass of water..

I love all the mess. Reminds me of school when you are trying to do in front of everyone something that worked just fine at home. Syringe falling apart was where I would scream and start cussing.

The flask ruptured at only 42 psi, corresponding to a water column height of roughly 93 feet, because glass is extremely strong under compression, but relatively weak under tension. Assuming that the inner surface of the jug is about 1400 square inches (eyeball estimate), the total bursting force was 1400 x 42, or 58,800 pounds (29.4 tons)!

I really did think that hydrostatic pressure was a result of a combination of the width and depth of a volume of water. Amazing to be introduced to the idea that it isn't. as well as be offered proof.

AMAZING

Her optimism, perkiness and cuteness reminds me of Pam from “The Office”

Hey, I came here looking for experiments to explain pressure for highschool students. We have done so many experiments in physicals, and have failed in few of them too. I can understand the last minute struggle that you have gone through. I see me in you, OMG so many similarities, thank you for this. I run a makerspace in a school as my part time (Passion) , I am a engineering professional. Love to get in touch with you.

Cool demo, and I hope some materials students were included. Probably something to be learned about the properties of the glass, and design of the bottle, as well as pressure.

Physics works! More people should see this video.

A most excellent demonstration. I was personally curious as to how you got the water to go down the tube, where I learned that soap was the solution, but I also observed a lack of safety gear on the individual in the video, where they should be wearing some kind of retention mechanism to catch them in the event of a fall.

A great experiment, showing us the magic that physics brings

This is the most interested I've ever been in a physics professor ... I mean in physics before.

Thanks for an excellent demonstration (and the follow-up explanation video) but equally for making into reality what was by all accounts just a thought-experiment before. Absolutely pioneering stuff and think this should be called the Visnjic barrel experiment, not the Pascal barrel, since all he did was sit in his dusty lab drawing it out instead of getting up there and inspiring people. I remember hearing about this when I took fluid mechanics as a course at uni decades ago, and I just couldn't accept what I was being told because it sounded so ridiclous....in the end I failed the class mainly because I hadn't developed the intuitive stuff that your experiment provides. The setup and execution of this was very impressive and while I did have the same confusion as a few others in that it appeared there might have been an air-tight seal between the syringe and the pipe, which had me scratching my head a bit, and this was partly obscured by the pressure gauge in the corner, I read a couple of other things about the experiment to understand what you were doing. This could of course be quickly clarified in the audio track although I imagine you are very busy. It is always fashionable for people to get excited about the latest technologies and developments but without a grasp of these basic physical things, no one can hope to understand them. By doing these clear and spectacular demonstrations you are helping to stem the tide of terrible pseudoscience and conspiracy that can only thrive when the basics are skipped and scientific terms are thrown around without knowledge of what they mean. It's absolutely vital work that you are doing and your enthusiasm is contagious. I also would like to add that I am disgusted at some of the dreadful sexist comments people have made on this video and it is truly shameful that you should have to put up with this, as you no doubt do throughout your career. Anyway, congratulations on this and no doubt many other future successes!

Svaka cast g-dja Višnić

Good for you.

In order to make this demonstration easier to perform, add the following apparatus. Just above the safety enclosure, on the thin tube, install a Tee fitting so that the tail of the T is horizontal to the ground. The other two connections to the fitting remain attached to the bottle hose and the tall building hose in the vertical orientation. This third horizontal connection would now be open to the atmosphere. Make sure the bottle and hose are filled with fluid up to the Tee Fitting. Attach a Valve to open part of the Tee Fitting. The opening of this valve can be incredibly small, even a pin hole sized opening. You will no longer need soap or glycerin in the fluid. With the Valve open, pour the fluid from the tower into the long vertical hose from the top floor. All the air in the vertical column will be expelled via the T fitting and the valve opening. Once fluid reaches the T fitting and the valve, fluid will begin to escape through the small opening in the valve. Now close the valve. Please note: for safety reasons, the valve should either be closed with a stick from a short distance or electrically via a solenoid valve.

Best videos every I have seen this

Wow, as scientist and diver love this experiment. Would have a bit of air on the top of the bottle and a second tube with an hydrophobic filter solved the bubble formation issue along the hose? The soap / syringe thing looks significant work and explanation to do. BTW, no idea that such a thick bottle could only handle 40 PSI, I guess is too big? I do experiments with soda bottles that can go over twice that.

I like this teacher.

In order to prevent the soap water from regurgitating back to the opening, you feed in the water slowly instead of forcing it in with the syringe. The idea is to allow the water to flow in along the side of the tube keeping its center empty so that the air can escape out as water flows down to fill in the space.

As you dive underwater (scuba) you do not feel the pressure because you are equalizing to ambient pressure. If you cannot clear (equalize) your oral/nasal passages to ambient, then yes you will feel the pressure. The same goes for lung volume using scuba, your lung volume will remain at the same volume at ambient pressure (the pressure of air you are breathing through your regulator/surrounding pressure) even if the water pressure is greater. It’s only when you breath-hold that your lungs will expand or contract. In any event, excellent presentation to demonstrate pascal’s law! I sure do miss physics class. Also, for preventing the tubing from blowing off the gauge, use a swage-lock fitting. They work well for high pressure applications.

Отличная демонстрация!

Great!