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Oxygen concentrator. An oxygen concentrator is a device that concentrates the oxygen from a gas supply (typically ambient air) by selectively removing nitrogen to supply an oxygen-enriched product gas stream. They are used industrially, to provide supplemental oxygen at high altitudes, and as medical devices for oxygen therapy.
A mechanical watch is a watch that uses a clockwork mechanism to measure the passage of time, as opposed to quartz watches which function using the vibration modes of a piezoelectric quartz tuning fork, or radio watches, which are quartz watches synchronized to an atomic clock via radio waves. A mechanical watch is driven by a mainspring which ...
A 3-way lamp, also known as a tri-light, is a lamp that uses a 3-way light bulb to produce three levels of light in a low-medium-high configuration. A 3-way lamp requires a 3-way bulb and socket, and a 3-way switch. In 3-way incandescent light bulbs, each of the filaments operates at full voltage. So unlike incandescent bulbs controlled by a ...
A stud finder (also stud detector or stud sensor) is a handheld device used with wood buildings to locate framing studs located behind the final walling surface, usually drywall. While there are many different stud finders available, most fall into two main categories: magnetic stud detectors and electric stud finders.
Bump-up CD. A bump-up CD — also called a “raise your rate” CD — builds in the ability for you to request a one-time rate increase if CD rates go up during your lock-in term. Longer term ...
Showing Suite and electronic lockbox provider SentriLock integrated systems in November 2010. Showing Suite's other direct partners are Keller Williams Realty, Exit Realty, Assist2Sell, and Realty Executives.
2HClO → HClO + ClO − + H + Dissociation of hypochlorous acid at pH 7.5 and 25C. 4NaCl + 3H 2 O → 4Na + + HClO + ClO − + OH − + 2Cl − + 2H 2 Net of all the above. Addition of Hydrochloric Acid to restore the pH to 7.5. HCl + 4Na + + HClO + ClO − + OH − + 2Cl − +2H 2 → HClO + OCl − + H 2 O + 4Na + + 3Cl − + 2H 2 .
An electronic gear-shifting system is a method of changing gears on a bicycle, which enables riders to shift with electronic switches instead of using conventional control levers and mechanical cables. The switches are connected by wire or wirelessly to a battery pack and to a small electric motor that drives the derailleur, switching the chain ...
Manifold vacuum, or engine vacuum in an internal combustion engine is the difference in air pressure between the engine's intake manifold and Earth's atmosphere . Manifold vacuum is an effect of a piston 's movement on the induction stroke and the choked flow through a throttle in the intake manifold of an engine.
The Way Things Work is a 1988 nonfiction book by David Macaulay with technical text by Neil Ardley. It is a whimsical introduction to everyday machines and the scientific principles behind their operation, describing machines as simple as levers and gears and as complicated as radio telescopes and automatic transmissions .