Density Rod

611-2100 Density Rod: What floats in cold water, sinks in hot? Our precisely calibrated cylinder - that's what! It demonstrates the differing density of a liquid at different temperatures. Illustrated instructions. Consists of a durable hollow aluminum cylinder (6.5 cm long and 1.9 cm in diameter) that fits most graduated cylinders. Instructions with experiments. Good for middle school. Wt: 3 oz. Reverse Density Rod also shown.