Relative density<span>, or specific gravity, is the </span>ratio of the density<span> (mass of a unit volume) of a </span>substance to the density<span> of a given reference material. Specific gravity usually means relative </span>density<span> with respect to water. The term "relative </span>density<span>" is often preferred in scientific usage.</span>
Recorded observations is called data.
That’s all i’ve gotten so far sorry
