vacuum actuator!

vacuum actuator

Comprehensive Analysis

1) "Vacuum" -- As to vacuum actuator 1vac·u·um Pronunciation: 'va-(")kyüm, -ky&m also -kyü-&m Function: noun Inflected Form(s): plural vac·u·ums or vac·ua /-ky&-w&/ Etymology: Latin, from neuter of vacuus empty, from vacare to be empty 1 : emptiness of space 2 a : a space absolutely devoid of matter b : a space partially exhausted (as to the highest degree possible) by artificial means (as an air pump) c : a degree of rarefaction below atmospheric pressure 3 a : a state or condition resembling a vacuum : VOID <the power vacuum in Indochina after the departure of the French -- Norman Cousins> b : a state of isolation from outside influences <people who live in a vacuum...so that the world outside them is of no moment -- W. S. Maugham> 4 : a device creating or utilizing a partial vacuum; especially : VACUUM CLEANER Pronunciation Symbols A vacuum is a volume of space that is essentially empty of matter, so that gaseous pressure is much less than standard atmospheric pressure. The root of the word vacuum is the Latin adjective vacuus which means "empty," but space can never be perfectly empty. A perfect vacuum with a gaseous pressure of absolute zero is a philosophical concept that is never observed in practice, not least because quantum theory predicts that no volume of space is perfectly empty in this way. Physicists often use the term "vacuum" slightly differently. They discuss ideal test results that would occur in a perfect vacuum, which they simply call "vacuum" or "free space" in this context, and use the term partial vacuum to refer to the imperfect vacua realized in practice. The quality of a vacuum is measured by how closely it approaches a perfect vacuum. The residual gas pressure is the primary indicator of quality, and it is most commonly measured in units of torr, even in metric contexts. Lower pressures indicate higher quality, although other variables must also be taken into account. Quantum mechanics sets limits on the best possible quality of vacuum. Outer space is a natural high quality vacuum, mostly of much higher quality than what can be created artificially with current technology. Low quality artificial vacuums have been used for suction for millennia. Vacuum has been a common topic of philosophical debate since Ancient Greek times, but it was not studied empirically until the 17th century. Experimental techniques were developed following Evangelista Torricelli's theories of atmospheric pressure. Vacuum became a valuable industrial tool in the 20th century with the introduction of the light bulb and vacuum tube, and a wide array of vacuum technology has since become available. The recent development of human spaceflight has raised interest in the impact of vacuum on human health, and life forms in general. a large vacuum chamber 1 Uses 2 Outer space 2) "Actuator" -- As to vacuum actuator ac·tu·a·tor Pronunciation: 'ak-ch&-"wA-t&r, -sh&- Function: noun : one that actuates; specifically : a mechanical device for moving or controlling something Pronunciation Symbols A three-dimensional actuator modelled using elastica theory. An actuator is a mechanical device for moving or controlling a mechanism or system. The actuator is usually a physical mechanism but also refers to an artificial agent intelligent agent. Examples include: Mechanics - motors, hydraulic pistons, etc. Human - Arms, hands, fingers, legs Mail transfer agent - Update software In engineering, actuators are a subdivision of transducers. They are devices which transform an input signal (mainly an electrical signal) into motion. Specific examples are Electrical motors, pneumatic actuators, hydraulic pistons, relays, comb drive, piezoelectric actuators, thermal bimorphs, Digital Micromirror Devices and electroactive polymers. Motors are mostly used when circular motions are needed, but can also be used for linear applications by transforming circular to linear motion with a bolt and screw transducer. On the other hand, some actuators are intrinsically linear, such as piezoelectric actuators. In virtual instrumentation actuators and sensors are the hardware complements of virtual instruments. Computer programs of virtual instruments use actuators to act upon real world objects. switch telepresence touch muscle pneumatic actuator ..." 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