What is ergs unit?

The erg is a unit of energy and work equal to 10⁻⁷ joules (J) in the International System of Units (SI). It is commonly used in physics and engineering to express small amounts of energy or work, such as in the movement of atoms and molecules. The erg is derived from the Greek word ἔργον (ergon), which means "work." In addition to the erg, other related units include the foot-pound (ft-lb) and calorie (cal), which are still used in some contexts. The conversion factor between the erg and the SI unit of energy, the joule, is 1 J = 10⁷ ergs.