Underwater Exploration: Underwater Pressure Science Experiment University of Wisconsin Sea Grant
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Test Underwater Pressure

1. You need: a quart jar full of water and a drinking straw

2. What to do: Put the end of the straw just below the surface of the water in the jar and blow. Now put the end of the straw near the bottom of the jar and blow again.

Which way is harder to blow bubbles?

Water has weight, as anyone who has lifted a bucket of water knows. The pressure in the ocean, or any body of water, is proportionate to the depth below the surface. At the great depths of underwater exploration the pressure may be tremendous and any underwater vehicle, like a submarine, must be very strong in order to withstand the weight of the water.