This 11x15" cloud chart is perfect for indoor and outdoor use! The laminated chart includes 20 colorful and coded photos on basic cloud formations. Reverse side includes additional weather information.
Vortex action? Potential energy being converted to kinetic energy? Centrifugal force? If you’ve never seen the Tornado Tube® in action you may n...
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Student grade bulb thermomer. Ranges from -35 to 50 degress celcius and -30 to 120 degrees fahrenheit. Measured in 2 degree subdivisions. Do not ...
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The New Astronomy Book ...
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The thermometer clings electrostatically to the window. Easy to read, no more squinting or running outside to read the thermometer. This thermome...
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A what? Radiometer is just a fancy name for this Solar Engine. It demonstrates the principles of energy conversion and shows how heat and mechanica...
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