suitable for KS4+. This new improved apparatus is ideally suited to demonstrate Boyle’s Law. Colored water or oil is gradually pumped from a reservoir into a tube containing air. Whilst the volume of air is read from the graduated tube, pressure is measured by a Bourdon gauge. The glass tube is calibrated and has graduations from 0 to 55cm. The tube is extra strong and additionally protected by a plastic safety screen. The Bourdon gauge is fitted with a transparent plastic back to allow students to see its working parts. The apparatus has a nozzle for a tube, to use a hand pump and comes with a needle valve to control and release pressure. This apparatus can be used with water instead of oil. Supplied without oil and hand pump.