A metric prefix in the International System of Units denoting a factor of 10^-15.

Informal term used in the context of extremely small quantities or scales.

बेहद छोटे मात्रा या पैमाने के संदर्भ में अनौपचारिक शब्द।

English Usage: "The femto amounts of particles were difficult to detect."

Hindi Usage: "फेमटो मात्रा के कणों का पता लगाना कठिन था।"