| − | The cgs unit of [[mass]] is the gram. Originally (see [[Metric system]] this was the primary unit of mass. Today a gram is defined as one-thousandth of a [[kilogram]]. | + | The cgs unit of [[mass]] is the gram. Originally (see [[Metric system]]) this was the primary unit of mass. Today a gram is defined as one-thousandth of a [[kilogram]]. |