A prefix meaning one-quadrillionth (1/1,000,000,000,000,000 or 10-15)
The same as multiplying by 10-15 (which is 0.000 000 000 000 001)
Prefix is f
Example: 12 fm = 12 femtometers = 12 quadrillionths of a meter (0.000000000000012 m)
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