Salco Erlenmeyer Flask  (500 ml, Pack of 6)

Borosilicate Glass Specific Gravity Bottle - 25ml, Relative density, or specific gravity, is the ratio of the density (mass of a unit volume) of a substance to the density of a given reference material. Specific gravity usually means relative density with respect to water. The term "relative density" is often preferred in scientific usage. It is defined as a ratio of density of particular substance with that of water.