The Physics To Go website will be unavailable Friday evening through Saturday afternoon as electrical work occurs in the American Center of Physics server room. Down time will begin at 6PM Eastern Time on Friday. Service is expected to resume by 6PM on Saturday, July 30.
Try this activity from the Exploratorium to see a surprising result. You'll make a Cartesian diver, a tube sealed in one end that barely floats when placed in water. The diver, made from an eyedropper or Bic™ pen, will float, sink, or hover in a soda bottle in response to pressure changes. The site also provides an explanation of what happens, suggestions for extensions, and a connection to the buoyancy of ships. This activity is part of Exploratorium's Science Snacks series.
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