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A small heater
is immersed in a thin vertical tank of water. This tank sits between
a point light source and a screen. When the heater is turned on,
the water nearby heats and rises due to convection. This is easily
visible on the screen because the heated water refracts the light
from the point source differently than its neighboring water (heated
water is less dense and hence refracts less.) A beautiful display
of the convection results. The light source can be slid closer to
or further from the tank, changing the magnification of the projected
image.
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