Sonometer, Simple
$34.95
Magdeburg Hemispheres, Simple
$3.49
A simple, inexpensive, and effective way to demonstrate air pressure. This set of 2 Magdeburg hemispheres measure nearly 2.5" in diameter, and are surprisingly strong, requiring 25+ pounds to pull them apart. Even better, no vacuum pump is required to use these.
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Reviews
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Magdeburg hemispheres
Simple, low cost version which shows the effect adequately