Special CGSA Units The base units in the CGSA unit system are identical to the SI units with the following exceptions: Table 3-14: Special Base Units in the CGSA Unit System Base quantity name symbol length centimeter cm mass gram g The CGSA unit system includes the following derived units that differ from the corresponding SI units: Table 3-15: Derived CGSA Units in COMSOL Derived quantity name symbol acceleration galileo Gal energy erg N/A force dyne dyn pressure barye N/A speed kyne N/A