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Encyclopedia > Gas syringe
A gas syringe showing its components separate and together
A gas syringe showing its components separate and together

A gas syringe also known as glass collecting bottle, is a piece of laboratory glassware used to draw a volume of a gas from a beaker or other closed system, or measure the volume of gas given off in a reaction. It is often used to remove gaseous products from a reaction. The syringe will have a hermetic seal around the top and sides, and moves more freely than a normal syringe. Most gas syringes can measure up to 100 cm3 with an accuracy of 1 decimal place. Image File history File links Download high-resolution version (740x754, 306 KB) two pictures I took stuck together I, the creator of this work, hereby grant the permission to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1. ... Image File history File links Download high-resolution version (740x754, 306 KB) two pictures I took stuck together I, the creator of this work, hereby grant the permission to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1. ... Brown glass jars with some clear lab glassware in the background Laboratory glassware refers to a variety of equipment, traditionally made of glass, used for scientific experiments and other work in science, especially in chemistry and biology laboratories. ... The volume of a solid object is the three-dimensional concept of how much space it occupies, often quantified numerically. ... This article or section does not adequately cite its references or sources. ... A chemical reaction occurs when vapours of hydrogen chloride in a beaker and ammonia in a test tube meet to form a cloud of a new substance, ammonium chloride A chemical reaction is a process that results in the interconversion of chemical substances. ... A hermetic seal is an airtight seal. ...


When using a gas syringe it is important to keep it dry. This is because the collected gases could disolve in water, resulting in inaccurate measurements.


The gas syringe works due to the fact that gases occupy a fixed space per mole, under equal pressure conditions. Thus the amount of a formed gas can simply be measured by measuring the space it occupies at standard pressure conditions. The inner part of the syringe and the outer tube should move freely, otherwise the friction could prevent the inner part being pushed back by the pressure of the collected gas, and thus the unequal pressure conditions would falsify the measurements.


  Results from FactBites:
 
Gas syringe - Wikipedia, the free encyclopedia (142 words)
A gas syringe showing its components separate and together
A gas syringe also known as "glass collecting bottle", is a piece of laboratory glassware used to draw a volume of a gas from a beaker or other closed system, or measure the volume of gas given off in a reaction.
A gas syringe is a syringe with a hermetic seal around the top and sides, and moves more freely than a normal syringe.
Restek Advantage, 1995, Volume 2: Why 5cm Syringe Needles? (1625 words)
Many years ago, the manufacturers of GC syringes looked upon their customers and noticed that there was no agreement on how long syringe needles should be for conventional vaporizing (split or splitless) injection.
Long syringe needles are required such that the sample expands from a point near the column entrance towards the rear.
Before being diluted with carrier gas, 2µl of a solution in hexane produce around 500µl of vapor, in dichloromethane as much as 900µl, which shows that the internal volume of an 80mm x 4mm ID liner must be fully exploited.
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