How many times longer is the diameter of a grain of sand than the diameter of the average cell in the human body? show your work. if the diameter of a grain of sand is about 2 x 10-4 meters and the diameter of a human hair is about 0.25 meters.

Diameter of grain of sand is = 

Diameter of Human hair is = 0.000025

We can write it as = 

So the ratio of diameter of grain of sand to diameter of human hair is 
=  = 8

So we can say diameter of grain of sand is 8 times longer than the diameter of average cell in human body.
 

The answer is poppy pants69