plural of phosphorus cycle

plural of uterine cycle

A vehicle powered by a person by means of pedals, such as a bicycle, tricycle or quadracycle.

(idiomatic) To act so as to end a repeating pattern of harmful or otherwise negative behavior.

(thermodynamics) An ideal heat-engine cycle in which the working fluid goes through four successive operations: (1) isothermal expansion to a desired point; (2) adiabatic expansion to a desired point; (3) isothermal compression to such a point that (4) adiabatic compression brings it back to its initial state.

plural of Metonic cycle

(thermodynamics) The cycle for the air engine proposed by Joule. In it air is taken by a pump from a cold chamber and compressed adiabatically until its pressure is equal to that of the air in a hot chamber, into which it is then delivered, thereby displacing an equal amount of hot air into the engine cylinder. Here it expands adiabatically to the temperature of the cold chamber into which it is finally exhausted. This cycle, reversed, is used in refrigeration.

A cycle employed in the liquefaction of gases, especially for air separation. It is essentially the same as the Siemens cycle, except in the expansion step: where the Siemens cycle has the gas do external work to reduce its temperature, the Hampson-Linde cycle relies solely on the Joule-Thomson effect, so the cold side needs no moving parts.

(chemistry) A thermochemical cycle, used to produce hydrogen, consisting of three chemical reactions whose net reactant is water and whose net products are hydrogen and oxygen.

(chemistry) A cycle concerned with the formation of an ionic compound from the reaction of a metal (often a Group I or Group II element) with a halogen or other non-metallic element such as oxygen; used to analyze reaction energies.