Search results
Results from the WOW.Com Content Network
A special form of the Pirani gauge is the pulsed Pirani vacuum gauge where the sensor wire is not operated at a constant temperature, but is cyclically heated up to a certain temperature threshold by an increasing voltage ramp. When the threshold is reached, the heating voltage is switched off and the sensor cools down again.
Main page; Contents; Current events; Random article; About Wikipedia; Contact us; Donate; Pages for logged out editors learn more
Its definition and measurement are often discussed in ultraviolet photoelectron spectroscopy literature, for example [2] As the vacuum level is a property of the electron and free space, it is often used as the level of alignment for the energy levels of two different materials. The vacuum level alignment approach may or may not hold due to ...
A vacuum gauge is used to measure pressures lower than the ambient atmospheric pressure, which is set as the zero point, in negative values (for instance, −1 bar or −760 mmHg equals total vacuum). Most gauges measure pressure relative to atmospheric pressure as the zero point, so this form of reading is simply referred to as "gauge pressure".
Discover the latest breaking news in the U.S. and around the world — politics, weather, entertainment, lifestyle, finance, sports and much more.
The incorporation of classroom assessment techniques is an age-old concept which teachers have been using and practicing for years. Whether a teacher uses a technique learned in training, or simply a strategy conjured up on their own, teachers need to know if their methods are successful and many feel that the desire to understand students' comprehension is instinctive.
Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!
When H0 scale was being introduced, the motors available were too large [4] to fit in scale-sized bodies and so as a compromise the scale was increased from 3.5 mm to 4 mm to the foot, but the gauge was not changed so other elements could be shared. For 00 therefore the track is about 12.5% narrower than it should be for the scale used.