Density Ball (LSE) Our 30-166 density ball is used demonstrate the effects of temperature and mineral content on density. The metal ball will float in cold water, and sink in hot! The density of water is not constant but depends upon several factors. The effects of salinity and temperature play a large role in the flow of earth's ocean currents. The 30-166 Denstity Ball can be used by varying salt content as well as temperature, to show the effects on density. Qty :