The centimeter-gram-second system (abbreviated cgi) of physical units of measure is a nearly obsolete system that was in widespread use in the nineteenth century, until the meter-kilogram-second system (mks), with its much larger units, replaced it. The main distinguishing feature of the cgs system is that most of its units are named for the physical properties they are supposed to measure, rather than for famous scientists, as is the case with the mks and SI systems.
The cgs unit of pressure is the barye. One barye exerts one dyne of force on every square centimeter of area.
Work and power
The cgs unit of work and energy is the erg (from the Greek εργον or ergon work). One erg is the amount of work done when exerting a force of one dyne over one centimeter, or the energy required to do that work.
The cgs system does not, properly speaking, have a separate unit of power. Instead, it expresses power in ergs per second.