Ziwei Zhao

Ziwei Zhao

Our team put ballons full of air in the water and then pubtured it using a knife. As can be seen in slow-mode, the air deformated under water pressure.

Team First Report

Ziwei Zhao

 

Experiment by: Chase Clevelana, Joe Ryan, Morgan Benninger, Ziwei Zhao.

Our team conducted an experiment that observe the flow of gas under water pressure. We recorded the experiment result by slow motion camera under natural light. The experiment was carried out in a fish tank. We put the air-filled balloon into the water, applying a vertical downward force directly above the balloon, and recording the moment of the balloon exploded.

As shown in the video, the gas in the balloon retained the shape of the balloon at the moment of the explosion, and then the gas particles were subjected to forces in different directions and move in different directions. The buoyancy formula of a gas particle can be expressed as:

The direction of the force of the gas particles at different positions is not the same. The closer the gas is to the bottom, the greater the upward buoyancy force in the vertical direction. Similarly, the closer the gas is to the top, the greater the downward buoyancy force. So the deformation of the gas showed like the shape of the mushroom.

The video also contains an experimental record showing the fluid phenomenon of intermittent bubbles rising to the water surface. In the video, we can clearly see that the air spilling out of the balloon speeded up when it got close to the previous air bubble. This is because when the bubble approaches the previous bubble, the water pressure around it decreases, causing its velocity to increase.

To make this video, we used balloons in different shapes and sizes for the best visual effect. We used natural light for lighting. We also eliminate reflections by adjusting the position of the shade cloth. The device we use is iPhone7 with 1080p, 120 fps, which has good hardware conditions to help us complete the shooting.

We tried to add food coloring in the experiment to get better visual effect. In the experiment, the power of the balloon explosion was greater than we expected. The change in air pressure caused the camera to vibrate, which made the video more shocking and interesting. Through this experiment, we have consolidated our knowledge about water pressure. I am very satisfied with this experiment.

 

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21 Comments. Leave new

  • William Tse
    Oct 3, 2018 12:31

    The triangle tied balloon was by far the most interesting balloon as the plume of air floated from the moment it was popped with the needle. The slow motion really captures the motion well, nicely done.

    Reply
  • Gregory Collins
    Sep 28, 2018 12:38

    The tied balloon pops was the most interesting of the Video. The escaped air was interesting.

    Reply
  • Chris Davidoff
    Sep 28, 2018 12:36

    I love the use of food coloring to hide the knife, I like that a lot!

    Reply
  • Peilin Yang
    Sep 28, 2018 12:34

    It illustrates the fun of slow-motion mode. The wisted balloon made the video special from the other teammate’s work. NIce work!

    Reply
  • Dylan Crane
    Sep 28, 2018 12:33

    It would be great if you could figure out a way to keep the human interaction out of it and pop the balloons without the viewer knowing how. You could also crop it in a little bit to add to the aesthetics of it. There were some great depictions of the air trapped being expanding

    Reply
  • Garrett Gerchar
    Sep 28, 2018 12:33

    Loving the blue ballon in the blueness of the water. Really like the ballon animal adds an interesting scene to the image.

    Reply
  • Brandon.Gushlaw
    Sep 28, 2018 12:33

    Halfway through you can see something really cool. The water spilling out of the balloon speeds up when it gets close to another air bubble. Great video

    Reply
  • Wenjin Li
    Sep 28, 2018 12:33

    The shape of the bubble looks really interesting. I like the slow motion video, which really captured the dynamic/motion of fluids.

    Reply
  • Ivan Komodore
    Sep 28, 2018 12:32

    I like the failed attempts at the beginning. Also the multiple shots helps to show the motion well. I think that the framing for some of them could be improved to keep focus on the balloons.

    Reply
  • Owen Brown
    Sep 28, 2018 12:32

    You have great framing in you clips with nice light. I though that the idea was very cool and well done!

    Reply
  • Michael Karns
    Sep 28, 2018 12:32

    I like all of the different set ups you had for breaking a balloon under water. Also I like when you poked a small hole in the balloon so the viewer could see the bubbles trickle out over time.

    Reply
  • Bradley Busek
    Sep 28, 2018 12:32

    The first shots are really funny to watch. I like how you incorporated a couple different types of shots in this video, it shows you put a lot of work into this. The slow motion was a great idea for this video.

    Reply
  • Noah Granigan
    Sep 28, 2018 12:32

    Very interesting shapes with the balloons and the bubbles, specifically the mushroom shape. Funny to include the unsuccessful popping of some of the balloons. Cool video!

    Reply
  • Anna Lynton
    Sep 28, 2018 12:32

    I like the shadows of the splash that you can see on the background. The bubbles are vert clear. I think some of the clips could be cropped to exclude the background and eliminate some blur.

    Reply
  • Hana Kieger
    Sep 28, 2018 12:32

    Nice job! I like that you show different clips of the same principle to give us an idea of the physics.

    Reply
  • Ross Cooper
    Sep 28, 2018 12:32

    This is also a very unique video. Very interesting dynamics here. I like the multiple angles. I would also love to see this with the phantom slow motion camera.

    Reply
  • Winston Douglas
    Sep 28, 2018 12:31

    I like when you tied the three balloons together and then popped the balloon that was on top. It made two smaller bubbles that looked cool as they traveled to the top.

    Reply
  • Justin Truong
    Sep 28, 2018 12:26

    I like how you used multiple shots. It really displays the same physics effects but in different situations

    Reply
  • This one shows how you guys did your experiment quite well. It is easy to understand what is going on. Maybe things could be edited down a bit and cropped in more.

    Reply
  • The bloopers in the beginning are a nice touch, shows what actually went into making the experiment happen. I like that all experiments were used within the video.

    Reply
  • Brent Eckles
    Sep 28, 2018 12:08

    I like all of the different shapes used and the trails captured. It shows the whole process of the experiment and not just the success’s. Big fan of the use of slo mo.

    Reply

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