The ball of a ballpoint pen is 0.5 mm in diameter and has an ASTM grain size of 12. How many grains are there in the ball

Given :

The ball of a ballpoint pen is 0.5 mm in diameter and has an ASTM grain size of 12.

To Find :

How many grains are there in the ball?

Solution :

Volume of ball of the ballpoint is :

Now, grain size of 12 has about 520000 grains/mm³.

Therefore, number of grains are :

the journeys of marquette, joliet and la salle a) new france expand.

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