Coffeemaker Geyser
Surprisingly, a coffee-maker works much the same way as a natural geyser! First, cold water is heated until it starts to boil. The bubbles then push the water above the boiling section up and water comes shooting out of the top. At boiling temperature (100C) at atmospheric pressure, the density of liquid water is 958 kg/m^3 and water vapor is 0.6 kg/m^3. This means as the liquid turns to gas, it will take up 1600 times more room than the liquid phase. In the coffee machine, it makes sense that some of the liquid water is forced out of the top, as there is not enough room for the liquid when even a small amount of the liquid water turns to gas. Pretty cool! (Wikipedia Article For More Info ) |
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