The Pulse Glass provides a dramatic demonstration of heat transfer with only the heat from your hand.
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Dramatic demonstration with only the heat from your hand. Two glass bulbs are connected with a glass tube and contain a colored, volatile liquid. Holding one of the bulbs in your hand causes the liquid to boil and the vapor to move into the other bulb where it bubbles rapidly.
Caution: Never use with any heat source warmer than body temperature.