How to Make a Barometer

Summary: A barometer is an instrument used to measure atmospheric pressure, and can measure this pressure by using water, air, or mercury. Pressure tendency can forecast short term changes in the weather, and numerous measurements of air pressure are used within weather analysis to help find surface troughs, high pressure systems, and frontal boundaries. A barometer is commonly used for weather predictions, as high air pressure in a region usually indicates fair weather, while low pressure indicates that storms are more likely. When used in combination with wind observations, reasonably accurate short-term forecasts can be made.

While barometers may sound like complex devices, they can be replicated through a rather simple process. In this free video series, an expert will teach you how to make a barometer using only a jar, balloon, and straw. What's more, he'll even show you how to decorate it! This poor man's barometer may be crude, but it's effective as well. You'll learn what supplies you need, how to seal the barometer with a balloon, and how to use a straw to replicate the needle of a traditional barometer. With these simple video instructions, you'll be able to predict the weather without ever having to read the paper or watch TV!