Heat transfer by convection Animation credit:
Equinox Graphics/Science Photo Library
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Caption:
The animation shows a beaker of water being heated by a
Bunsen burner flame. A zoom into the beaker reveals the
temperature of the water. White is the warmest, followed by
red, yellow and green to blue (coolest). Warm water is less
dense than cold water, so it rises through the cold water
above, spreading out at the surface before descending at the
sides. This sets up convection currents in the water
(arrows), which serve to spread the warmth throughout the
water.
