For closed systems with no external source or sink of energy, the first law of thermodynamics states that a system's energy is constant unless energy is transferred in or out by mechanical work or heat, and that no energy is lost in transfer. This means that it is impossible to create or destroy energy.
GROGAN. The Irish name Grogan is derived from the native Gaelic O'Gruagain Sept that was initially located in County Roscommon but which became widely dispersed. The name is derived from a Gaelic word meaning 'fierceness'. Grugan, Groggan, Groogan and O'Grogan are among the variants of this name.he Irish name Grogan is derived from the native Gaelic O'Gruagain Sept that was initially located in County Roscommon but which became widely dispersed.
Greer /greer/ [2 sylls.] as a girls' name (also used as boys' name Greer) is pronounced gryr. It is of Scottish and Latin origin, and the meaning of Greer is watchful, vigilant.Surname and variant of Gregory. Notable in the 1940s and 1950s due to actress Greer Garson.Kreatif forms: Greerda, Greergi, Greerta.reer /greer/ [2 sylls.] as a girls' name (also used as boys' name Greer) is pronounced gryr. It is of Scottish and Latin origin, and the meaning of Greer is watchful, vigilant.