Density = massvolume\frac{\text{mass}}{\text{volume}}volumemass
mass of hydrometer = y kg
80% hydrometer's volume submerge(20% above the fluid) = 45\frac{4}{5}54 x 2y x 10−5^{-5}−5 = 8y×10−55\frac{8y \times 10^{-5}}{5}58y×10−5
Density = y x 58y×10−5\frac{5}{8y \times 10^{-5}}8y×10−55 = 6.25 x 104^{4}4kgm3^{3}3
