The ratio of the density of a substance to the density of water is usually referred as:
Which of the following statement(s) is/are true about relative density? Statement 1: Relative density is known as the specific gravity of the substance. Statement 2: Relative density of a substance is the ratio of the density of the substance to the density of water at 4∘C. Statement 3: Relative density of a substance is the ratio of the mass of water at 4∘C to the mass of a substance at 4∘C. Statement 4: Relative density is unitless.