ABSTRACT
Mass is a basic property of the substance, and is constant, regardless of location. It is most frequently registered in units of grams, or pounds; it is measured with an analytical balance which compares it against a known mass. The density of materials is affected by temperature. A solid submerged in a body of water will displace its own volume. The displacement causes a rise in water level equivalent to the volume of the submerged object. Weight is the effect of the force of gravity upon a substance, and is measured with a scale. Most solids will settle more effectively in warm waters than in cold waters because the water is denser when cold. Though the density of gases is greatly affected by pressure, the density of most liquids, including water, is not. Substances with a Specific Gravity of less than 1 will float. Substances with a Specific Gravity of more than 1 will sink.
