Buoyancy Balance (0776) Dimensions: 17 x 17 x 13 cm. Simple and effective instrument to experience buoyancy of air. This apparatus is constituted of a polystyrene foam ball suspended on a balance arm and mounted on a PVC stand. When located in a vacuum jar and evacuated, the balance inclines as the buoyancy force Diminishes. COMPONENTS : • Balance • Sphere with Hook. LAWS & PRINCIPLES INVESTIGATED : • Buoyancy of air • Air Pressure and level of vacuum. Qty :