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.
Gravamen is not a word you hear every day, but it does show up occasionally in modern-day publications. It comes from the Latin verb gravare, meaning to burden, and ultimately from the Latin adjective gravis, meaning heavy. Fittingly, gravamen refers to the part of a grievance or complaint that gives it weight or substance. In legal contexts, gravamen is used, synonymously with gist, to refer to the grounds on which a legal action is sustainable. Gravis has given English several other weighty words, including gravity, grieve, and the adjective grave, meaning important or serious.