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).
Image copyright is attributed to the appropriate company. SAVOIR BEDS: This is The Royal State which is the ultimate in sleep luxury. Only sixty will be made to celebrate the 60th anniversary of the Queens Coronation. This is the industry benchmark for Bespoke bed design and manufacture and will set you back a cool Â£115,000 or thereabouts.