In 1824 he studied the system which he called the " working substance " ( typically a body of water vapor ) in steam engines, in regards to the system's ability to do work when heat is applied to it.
22.
Carnot reasoned that if the body of the working substance, such as a body of steam, is returned to its original state at the end of a complete engine cycle, that " no change occurs in the condition of the working body ".
23.
Other modifications were made to the technical regulations on high-pressure gas pipelines ( 22 June and 10 September 1982 ) and on installations where acetylene is present and calcium carbide is stored ( 30 September 1982 ), while new recommended levels for dangerous working substances were incorporated into the regulations governing these substances ( 10 May 1982 ).
