Density Equations:

1.     Density  = $\frac{(Mass )}{Volume}$  
2.     Mass    = $Density \times Volume$
3.     Volume =$\frac{ (Mass )}{Density}$
   

DO YOU KNOW?

Earth's atmosphere extends upward about a few hundred kilometers with continuously decreasing density. Nearly half of its mass is between sea level and 10 km. Up to 30 km from sea level contains about 99% of the mass of the atmosphere. The air becomes thinner and thinner as we go up.