Answer to Question #165960 in Astronomy | Astrophysics for Alejandro

Question

If you have a box of 10 cm of edge, how many grains of sand would fit in this box?

Answer 1

A grain of sand weighs about

$$m=10^{-6}g$$

$$N=\frac{V}{V_g}=\frac{V\rho}{m}\\N=\frac{10\cdot1.45}{10^{-6}}=1.45\cdot10^{7}$$