pressure

What happens to air in your lungs at altitude?

October 10, 2009

Here’s a provocative question about the atmosphere, from one of those most curious citizens of the world — 6th graders. “At sea level you take a breath and fill a sandwich bag with it easily.  On Mt Everest, not using bottled air, could you do the same thing? I guess the question is “How full […]

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Hands on Science Sunday: Feeling pressured?

May 31, 2009

Here’s today’s science classroom activity.  We’re surrounded by the crushing weight of layers of atmosphere above us, but we don’t feel it.  Why?  Our perception is tuned to differences, not absolutes.  If we were in a completely pink world, we would notice anything that wasn’t pink, but (I’m pretty sure) after a few minutes, we […]

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More crazy ideas

February 12, 2009

Look at this picture.  What will happen to the balloon when we push the cart forward, and why?  (Don’t watch the video first — come up with ideas and reasons first). Make as many predictions, and reasons, that you can, even if you don’t believe them all. Remember that coming up with the right explanation […]

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