1
Rain and hail will be suspended by the updraft inside a thunderstorm until the weight of the hail and water can no longer by supported. Usually, the stronger the updraft in a thunderstorm, the more intense the storm and the larger size of hail that can be produced. Suspending a ping pong ball in th...
Grade Level   7 8 9 10 11 12
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2
Clouds are divided into four basic forms (Cirro-form, Strato-form, Cumulo-form and Nimbo-form) at three basic levels (low, middle, and high) in the atmosphere. Many locations may experience all of these different types of clouds daily. The students will become better observers of the sky by...
Grade Level   3 4 5 6 7 8 9 10 11 12
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3
Clouds are divided into four basic forms (Cirro-form, Strato-form, Cumulo-form and Nimbo-form) at three basic levels (low, middle, and high) in the atmosphere. Many locations may experience all of these different types of clouds daily. The students will become better observers of the sky by...
Grade Level   3 4 5 6 7 8 9 10 11 12
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4
Barometers using mercury are heavy and fragile. The first working version of an aneroid (without water) barometer was built in 1843 by French scientist Lucien Vidie. This made the barometer very portable and it became a commonly used meteorological instrument. It was still calibrated to the...
Grade Level   9 10 11 12
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5
The amount of air over us is constantly changing. As a result, the weight of that air, called pressure, is constantly changing. These changes in air pressure are indications of changes in our weather. We measure this change using a device called a barometer (bar-meter or measurer).
Grade Level   9 10 11 12
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6
Pressure is not only a matter of altitude but also dependent upon the temperature. As the temperature increases so does the pressure. The molecules and atoms that comprise the air we breathe gain energy as they absorb heat. That increase in energy results in faster moving atoms which we observe as...
Grade Level   7 8 9 10 11 12
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7
Bernoulli's principle states that in fluid flow, an increase in velocity occurs simultaneously with decrease in pressure. The students will discover that the faster air moves (air acting as a fluid), the lower the pressure beccomes within that air flow. They will see this effect blowing between two...
Grade Level   7 8 9 10 11 12
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8
To show that air has weight, the air is removed from one of two balanced balloons throwing the balance off.
Grade Level   5 6 7 8 9 10 11 12
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9
"We typically do not """"feel"""" atmospheric air pressure. Why? Since air surrounds our bodies, and of all things, the pressure, as a result of the air, is applied equally on all sides. For example, if someone holds an 8.5x11"""" sheet of paper by their hand at arms length, the weight of the air...
Grade Level   7 8 9 10 11 12
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10
"Welcome to JetStream, the National Weather Service Online Weather School. This site is designed to help educators, emergency managers, or anyone interested in learning about weather and weather safety. The information contained in JetStream is arranged by subject, beginning with global and large...
Grade Level   6 7 8 9 10 11 12
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