Boyleft s Law Apparatus, To demonstrate the relationship between pressure and volume of gas. Consists of a 29 mm diameter graduated cylinder with a piston and a screw valve, 60mm manometer scale is from -1000 to 3000 hPa with 50
Jolly bulb metal - superior, Palm-sized, hollow metallic ball with a manometer connected to it for demonstrating change of pressure in a closed volume of air when heated or cooled, 80 mm diameter