1. Education  Discuss in my forum  Surface Tension Physics
Experiments & Tricks   Quarters in a Full Glass of Water  This
is a neat trick! Ask friends how many quarters can go in a
completely full glass of water before it overflows. The answer
will generally be one or two. Then follow the steps below to
prove them wrong.  Needed materials:    • 10 to 12 Quarters   •
glass full of water The glass should be filled to the very rim,
with a slightly convex shape to the surface of the liquid.
Slowly, and with a steady hand, bring the quarters one at a time
to the center of the glass. Place the narrow edge of the quarter
in the water and let go. (This minimizes disruption to the
surface, and avoids forming unnecessary waves that can cause
overflow.)  As you continue with more quarters, you will be
astonished how convex the water becomes on top of the glass
without overflowing!  Possible Variant: Perform this experiment
with identical glasses, but use different types of coins in each
glass. Use the results of how ma