A '''physical constant''' is a measurable quantity in [[nature]] that never changes.<ref>Wile, Jay L. ''Exploring Creation With Chemistry''. Apologia Educational Ministries, Inc. 1998</ref> | A '''physical constant''' is a measurable quantity in [[nature]] that never changes.<ref>Wile, Jay L. ''Exploring Creation With Chemistry''. Apologia Educational Ministries, Inc. 1998</ref> |