7 June, 2000
Up from the Deep
June 7, 2000
Wait a minute! What’s Captain Garrett doing in the science lab drawing on cups?
Captain Garrett is responsible for many of the operations on the Healy. He is also keenly interested in what the scientists are learning through their experiments. Today he’s joining us to have a little bit of scientific fun.
As you know, scientists are naturally curious people. They are always asking, "I wonder what would happen if…?" Then they dream up experiments to test their ideas.
No one knows who was the first person to wonder what would happen to a styrofoam cup if it were lowered down to the bottom of the ocean. But the famous experiment has become a tradition on oceanographic research cruises.
Janice and I had heard about this experiment before coming aboard the Healy. We brought along styrofoam cups decorated by our students before we left. These cups would be making the long journey to the bottom of the sea.
After Captain Garrett and the rest of the crew finished decorating their cups, we placed them in a yellow net bag and attached them to the bottom of the frame of the rosette sampling system. The rosette would carry several different scientific instruments more than a mile down to the ocean floor. Our styrofoam cups were along for the ride.
So what do YOU think happened to the cups? Here's a hint:
Have you ever dived to the bottom of a deep swimming pool? If so, you probably have felt the pressure of the water on your ears as you got deeper and deeper. This is called water pressure.
Every day we have air pressing on us from all directions. We don't really notice it. When the water in the swimming pool presses down on us, though, we can feel it. That's because water is so much heavier than air.
Now imagine diving more than a mile below the surface. If you look up, you wouldn't even be able to see the sky - it would be too far away. Now think of all that water pressing down on you. That's a lot of pressure!
That's just what was happening to our cups at the bottom of the ocean!
After an hour, the rosette was brought back up to the surface. We ran to untie the net bags and take a look at our cups. Yikes! The cups had shrunken! They were now miniature versions of the ones we had placed in the bags!
Why did this happen? Think about how light styrofoam cups are. That's because the styrofoam has lots of holes in it. Those holes are filled with air. When the cups were under water, the pressure of the water squeezed all of the air out of the styrofoam. The styrofoam material was compressed so much that the cups shrunk to a fifth their normal size.
We’ll bring our cups back to school and share them with all of the students. You don't have to wait until then to see them, though. Look below at the pictures to see how they turned out.
Are scientists out here in the Arctic just to shrink styrofoam cups? Of course, not! To find out about the rosette and what it does, click on Janice’s page.
DAILY DATA LOG (6/07/00)
Air Temperature: 0 degrees C / 31 degrees F
Sunrise 4:44 a.m.
Sunset 11:06 p.m.
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