Instead of a class demonstration, let your students perform their own experiments about the mysteries and science of air pressure. This set comes complete with a miniature shatter-proof bell jar with plate, a 2-piece air pump with Luer-Lok® quick connects, suction cup, balloons, flask for boiling-point experiments, and detailed instructions.

With this set you can create a 95 to 98% vacuum in the chamber. Perform experiments about the mass and density of air; boiling points of liquid; expansion of gasses in a balloon; how an air pump works; and more. Bell jar is 9 cm tall, 7 cm in diameter, and has 4-mm-thick walls.

/!\ WARNING: CHOKING HAZARD-Children under eight yrs. can choke or suffocate on uninflated or broken balloons. Adult supervision required. Keep uninflated balloons from children. Discard broken balloons at once.