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HOW IS FOG MADE? Fog is the condensation of moisture in the atmosphere near the surface of the earth. You might discuss the wonders of Mother Nature's fog-making capacity with the California Highway Patrol or with the Apricot Growers Council. Any of the following experiences will help you realize that real fog is formed in an analogous way through the rapid cooling and condensation of water vapor in the air near the earth's surface. a. Heat some water in a container until it boils, then fill a large bottle slowly with the boiling water. Next, empty all but 1 inch of water from the bottle, and hold the bottle in such a way that the light source (e.g., window, electric light) comes from behind you. Now set the bottle on a tray of ice cubes, and describe what happens inside the bottle. You will realize that in a similar way, fog forms at night when the earth cools rapidly (represented by the ice cube tray) and the air next to it cools in turn and comes in contact with the warmer moist air above. b. Take a large fruit juice can, put some ice in it, and add a handful of salt to make it even colder inside the can. Set a smaller can on the ice so that the tops of both cans are even. Pack more ice and salt into the space between the two cans, and exhale into the smaller can. You will see fog form and remain in the smaller can. Similarly, real fog forms and clings in valleys when the ground is cooled rapidly. Fog is important to some crops, such as apricots. If we have no fog (or just a little fog) during a winter, the apricot crop will be substantially smaller than it is after a winter with frequent fog. You should go out in your front yards on a very foggy day, and sing. Or shout. Sound carries differently in fog than in clear air. Fog is also dangerous. Be careful!  Any problems with this page? Send URL to
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