In simple words, an Oxygen Concentrator works on electricity; takes in room air, removes Nitrogen from it and provides upto 95% pure Oxygen. The composition of air (78% Nitrogen, 21% Oxygen and 1% other gases like Carbon Dioxide, Argon, etc.) clearly shows that air is mainly comprised of two gases: Nitrogen and Oxygen [together 99%].
Word Origin and History for savoir-faire Expand. n. instinctive knowledge of the right course of action in any circumstance, 1815, from French, literally to know (how) to do, from savoir to know (from Latin sapere; see sapient) + faire (from Latin facere; see factitious).
Belvoir Castle (/ËbiËvÉr/ BEE-vÉr) is a stately home in the English county of Leicestershire, overlooking the Vale of Belvoir (grid reference SK820337).o Belvoir castle has been the home of the Manners family for five hundred years, and seat of the Dukes of Rutland for over three centuries. In the early 17th century, castle servants Joan, Margaret and Phillipa Flower were accused of murdering the 6th Earl 's two young sons by witchcraft.