A simple hydrometer consists of uniform cylinder suitably weighted to float upright in most common liquids. It is graduated to read the relative density of a liquid directly. Which of the following is NOT correct?
A. When placed in a liquid, it displaces exactly its own weight of the liquid B. Its graduation increases from top to base C. When placed in a liquid, it displaces exactly its own volume of the liquid D. The product of the volume and density of liquid displaced is equal to its mass
