This ‘Vacuum Bazooka’ offers a fun way to demonstrate air pressure and projectile velocity. The apparatus consists of a clear acrylic tube which is open at both ends but has a paper ‘seal’ in place at one end (e.g. a post-it note), and a vacuum cleaner hose attached via a side opening. Once switched on, the vacuum cleaner creates a reduction in air pressure at that end of the tube and a lightweight projectile can be released at the other end. Due to the difference in air pressure at each end of the tube, when the projectile is released it accelerates towards the paper seal. The momentum created allows it to burst through the seal and out the end of the tube at quite high velocity - travelling for 5 metres or more. Altering the mass of the projectile allows further study of acceleration, momentum etc. Apparatus includes 50 cm x 50 mm acrylic tube with tapered vacuum hose adapter and customised projectiles. The paper seal is held in place simply by placing over the tube end, once the vacuum cleaner is switched. Apparatus requires a vacuum cleaner with hose.