EQUIPMENT
    Density Ball
    Beakers
   


NARRATIVE
            The Density Ball consists of a Copper Ball loaded to such a weight that when immersed at approximately 45° C, it will sink and when immersed in water at 15.5° C or less, it will float. As the density of water at 45° C is 0.990 and at 15.5° C is 0.999, the adjustment of the temperature of the two bodies of water is not perfunctory, but must be done with considerable care. The difference in weight between the hot and cold water displaced by the ball is less than one gram. The hot water must be maintained at 45° C or above during the experiment.