m=10 mg=10⁻⁵ kg
d=10⁻¹⁰ cm=10⁻¹² m
Rp=6300 km=6,3*10⁶ m
μ=2H+O=2*1+16=18 g/mol=18*10⁻³ kg/mol
υ=m/μ=10⁻⁵/18*10⁻³=10⁻²/18=5,55*10⁻⁴ moli
υ=N/Na=>N=υ*Na=5,55*10⁻⁴*6,02*10²³=33,41*10¹⁹ molecule
l=Nd=33,41*10¹⁹*10⁻¹²=33,41*10⁷ m
L=2πRp=6,28*6,3*10⁶=39,54*10⁶ m
n=l/L=33,41*10⁷/39,54*10⁶=8,44=>se inconjoara de aproximativ 8 ori
