RVFM Mini Magdeburg Hemispheres

Mini-Magdeburg-Hemispheres-RVFM-P03026-2-These-simple-and-economical-mini-Magdeburg-hemispheres-offer-an-ideal-means-of-demonstrating-the-effect-and-strength-of-atmospheric-pressure-These-hemispheres-are-surprisingly-strong-requiring-25lb-or-more-of-force-to-pull-them-apart-RVFM-Mini-Magdeburg-Hemispheres... More