For example, lifting a mass m by h meters increases its potential energy by mgh , where g is the acceleration due to gravity. The rate at which energy is supplied. An insoluble substance that has been formed from substances dissolved in a solution. Precipitation is the conversion of a dissolved substance into insoluble form by chemical or physical means. Compare with accuracy .
Precision is reproducibility.
Don't confuse precision with accuracy . The SI unit of pressure is the pascal, defined as one newton per square meter. Other common pressure units are the atmosphere , the bar , and the Torr . primary standard. A stable, high-purity material used in titrations and other chemical analyses to prepare solutions of precisely known concentration, or to determine the concentrations of substances which react with the primary standard material. Compare with reactant .