Guinea and Feather Apparatus, 20" Glass Tube Science at Home_Chemical Science 101-piece teacher-grade molecular model set

101-piece teacher-grade molecular model set with 51 atoms and 50 bonds covering carbon

5 mm in diameter

and 6V-powered ignition light staging each step

Diamond lattice kit with 39 carbon atoms and 60 connectors for building the tetrahedral covalent network that gives diamond its exceptional hardness and optical properties

Seventy-eight-piece molecular model set with 45 atoms and 33 bonds for building basic organic and inorganic structures

Guinea and Feather Apparatus, 20" Glass Tube Science at Home_Chemical Science 101-piece teacher-grade molecular model setDrops a dense object and a feather together inside a 20 inch evacuated glass tube, showing that air resistance not mass accounts for differences in fall time under gravity.