Upside Down Glass of Water Experiment | Floating Water Trick

This floating water trick is a super fun and easy way to teach kids (and adults) about the incredible power of air pressure!

You won't believe your eyes when a glass filled with water is tipped upside down with just a thin piece of paper holding the water from gushing out!

Supplies Needed:
Cup or Glass
Water
Paper
Bowl (just in case you spill)

The science behind this upside-down glass of water experiment:

With the cup very full of water, there is not much room for air inside the cup. As the cup is tipped upside down, a few drops of water leak out between the cup and the paper, and allow a few air bubbles inside.

With a very low amount (volume) of air inside the cup and mostly water inside the cup, the air pressure on the outside is much greater than the air pressure inside the cup.

As a result of the higher air pressure on the outside of the cup and the lower pressure on the inside of the cup, the outside air pushes against the paper on the bottom of the cup and keeps the paper and water in place!

Get the complete science behind this and instructions on how to do this cool water trick right here:

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Be sure to watch all the way to the end of the video if you want to see the bloopers of what happens when this experiment doesn’t go as planned! 😮