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.
grenÂ·aÂ·dier. n. 1. a. A member of the British Grenadier Guards, the first regiment of the royal household infantry. b. A soldier who is a member of a special corps or regiment.c. A soldier equipped with grenades. 2.Any of various deep-sea fishes of the family Macrouridae, having a long tapering tail and lacking a tail fin.. a member of the first regiment of royal household infantry (Grenâ²adier Guardsâ²) in the British Army. 2. a foot soldier in certain former elite units, specially selected for strength and courage. 3. (formerly) a soldier who threw grenades.