Pneumatic Troughs
Pneumatic troughs are used for collecting gases over water in experimental setups.Made from durable materials, they provide stable support for gas jars and measuring cylinders.Australian classrooms and laboratories rely on pneumatic troughs for safe and effective gas experiments.
Glass Pneumatic Trough, 250 x 125 mm
AUD 49.90 (Ex GST)
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Glass Pneumatic Trough, 250 x 125 mm is a laboratory vessel used to hold water during gas collection experiments. It provides a stable water reservoir for positioning an inverted gas jar, measuring cylinder or other compatible collection vessel while gas is delivered through laboratory tubing.
In a typical gas collection by water displacement setup, the collection vessel is filled with water and inverted below the water surface inside the trough. Gas produced by a reaction passes through the delivery tube, enters the inverted vessel and displaces the water. This allows the collected gas to be observed and, when suitable graduated glassware is used, its approximate volume to be measured.
Water displacement is most appropriate for gases that have suitable water solubility and do not react significantly with water under the experimental conditions. A gas that dissolves readily or reacts with water may not be collected accurately using this method because part of the gas can be lost into the liquid. Gas solubility can also change with temperature and pressure, so the experimental method and gas properties should be checked before use.
Gas collected over water also contains water vapour. Where pressure or gas quantity is being calculated, the water vapour contribution may need to be considered using Dalton’s law of partial pressures. This is particularly relevant in quantitative experiments involving gas pressure, molar volume or reaction yield.
The clear glass construction allows users to see the water level, delivery tube position and collection vessel during the experiment. Before use, the trough should be checked for cracks, chips, sharp edges or other visible damage. It should be placed on a level, stable bench and filled only to the depth required for the selected apparatus. Sudden impact and rapid temperature changes should be avoided unless the manufacturer confirms that the glass is suitable for those conditions.
The product title confirms glass construction but does not identify the exact glass composition. If manufacturer documentation confirms that the trough is made from borosilicate glass 3.3, ISO 3585 provides the relevant material-property reference. ASTM E438 covers glass types commonly used in laboratory apparatus. Neither standard should be stated as confirmed product compliance without supporting manufacturer documentation.
For LabChoice Australia customers, the Glass Pneumatic Trough, 250 x 125 mm provides a practical option for schools, universities, chemistry teaching laboratories and science demonstration facilities carrying out compatible gas preparation, water-displacement collection and gas-volume experiments.