An atom is very small. The size of a table tennis ball to the earth is very approximately equivalent to the size of an atom to the table tennis ball. For those interested in the details, the diameter of the earth is 12.7 x 106m, that of a table tennis ball is 3 x 10-2m, and that of an atom is 10-10m. (106 means 10 multiplied by itself five times, or 1,000,000. 10-2 means 1/102, or one divided by 10 twice or 0.01.) |