This collapsing metal can makes a good introduction to air pressure for any age student. The can, when evacuated by a hand pump, will crumple right before your eyes. You can also boil a small amount of water inside to drive out all the air, then cap it and let it cool. Includes one sturdy metal can, rubber stopper with hose nipple to evacuate can, and screw cap. 23 x 17 x 10 cm in size. This item is single use only.
