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"Short path" refers to the short distance that the vapors of the distillate need to travel, which helps reduce loss and speed up collection of the distillate.This type of distillation is generally performed under vacuum to prevent the compound from charring due to atmospheric oxygen, as well as to allow the distillation to proceed at a lower temperature.
Historically, the definition of a scientific instrument has varied, based on usage, laws, and historical time period. [1] [2] [3] Before the mid-nineteenth century such tools were referred to as "natural philosophical" or "philosophical" apparatus and instruments, and older tools from antiquity to the Middle Ages (such as the astrolabe and pendulum clock) defy a more modern definition of "a ...
While the outward designs of apparatuses can vary greatly, most apparatuses use a sample loaded into a sealed capillary tube (melting-point tube), which is then placed in the apparatus. The sample is then heated, either by a heating block or an oil bath, and as the temperature increases, the sample is observed to determine when the phase change ...
electrical equipment Apparatus for generation, transmission or utilization of electric power. electrical grid A geographically distributed system to connect source and users of electric power. electrical impedance That property of a circuit that resists the passage of electric current, usually in the context of alternating current.
Laboratory automation; Laboratory centrifuge; Laboratory drying rack; Laboratory informatics; Laboratory oven; Laboratory rubber stopper; Laboratory sample tube; Laboratory scissor jack; Laboratory water bath; Laminar flow cabinet; Langmuir–Blodgett trough; Large diameter centrifuge; Lattice light-sheet microscopy; Liebig condenser; Light ...
The Marsh funnel viscometer measures viscosity from the time (efflux time) it takes a known volume of liquid to flow from the base of a cone through a short tube. This is similar in principle to the flow cups (efflux cups) like the Ford , Zahn and Shell cups which use different shapes to the cone and various nozzle sizes.
Pneumatic trough, and other equipment, used by Joseph Priestley. The bottle is filled with water, inverted, and placed into the pneumatic trough already containing water. The outlet tube from the gas-generating apparatus is inserted into the opening of the bottle so that gas can bubble up through it, displacing the water within. [4]
A Langmuir–Blodgett trough (LB trough) is an item of laboratory apparatus that is used to compress monolayers of molecules on the surface of a given subphase (usually water) and to measure surface phenomena due to this compression. It can also be used to deposit single or multiple monolayers on a solid substrate.
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