PL A pneumatic trough is a laboratory apparatus used for collecting gases over water. It is usually made of durable plastic, glass, or metal and has a wide, open container design. The trough is filled with water, allowing gases to be collected in inverted jars or cylinders by displacement of water. It is commonly used in chemistry experiments involving gas preparation and collection. The design ensures safe handling and accurate observation of gas evolution. Pneumatic troughs are widely used in school and college laboratories. They are easy to clean, reusable, and essential for basic gas experiments.

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