Here's a breakdown:
* Joule (J): The standard unit of energy in the International System of Units (SI). It's defined as the energy transferred when a force of one newton acts over a distance of one meter.
* Milli (m): A metric prefix that means "one thousandth". So, 1 millijoule (mJ) is equal to 0.001 joules (J).
Examples of energy measured in millijoules:
* The energy stored in a small capacitor.
* The energy released by a small laser pulse.
* The kinetic energy of a small insect in flight.
Conversion:
* 1 J = 1000 mJ
* 1 mJ = 0.001 J
Hopefully, this explanation is clear!