How to Build a Barometer
I'm fond of this project, because it can be done in any setting. Barometers are designed to be used indoors, so you do not need access to the outdoors.
This simple tool is a wonderful way to observe and learn about changes in air pressure. Use your webcam or camcorder to keep track of weather changes.
Barometer - Measure Air Pressure
1. Clean all labels from the jar and bottle
2. Fill the jar with water to just over the mouth by an inch.
3. Add a few drops of food coloring.
4. Tip the bottle and jar enough to let air bubbles escape.
5. Slide the rubber band onto the jar. Position it at the same level as the water.
6. Place the barometer in a place out of direct sunlight but where it is visible.
7. As the water rises and falls in the neck of the bottle, use the rubber band to mark the new level.
Testing this idea:
Take a large cooking pot and fill it with water. What happens to the water level when you press down on it? What happens when you remove your hands? Can you relate to how the non visible air around you would follow the same pattern.
High pressure happens when air is pressing down on the earth. What does your barometer do when there is high pressure? Low pressure happens when the air is rising. What happens to your barometer? What do the clouds look like when there's high pressure and when there's low pressure? Do you notice patterns during morning, afternoon or evening observations?
Weather is always changing. Use the barometer with other weather machines, like the anemometer, wind compass and hygrometer for a full picture of weather activity.
Writer and naturalist JJ Murphy, http://www.WriterByNature.com, offers creative nature curriculum, wild food recipes, fiction, poetry, articles and writing services for individuals, entrepreneurs, small businesses and ecologically aware companies.
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