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Barometer tubes
A barometer tube is a slender, sealed, and typically transparent tube used in barometers to measure atmospheric pressure. It is usually filled with a liquid, often mercury, but sometimes water or another fluid, which rises or falls within the tube in response to changes in atmospheric pressure. The height of the liquid column in the tube serves as an indicator of the current atmospheric pressure, with higher pressure causing the liquid to fall and lower pressure causing it to rise. This measurement helps in predicting weather changes and understanding atmospheric conditions.
bell in vacuum
A "bell in vacuum" apparatus is a scientific setup used to demonstrate the effects of reduced air pressure (vacuum) on sound transmission. It typically consists of a bell or sound-producing object enclosed within a sealed chamber from which air has been removed, creating a low-pressure environment. This apparatus is designed to illustrate how sound travels differently in a vacuum compared to in normal atmospheric conditions, highlighting the role of air molecules in sound propagation.
blow pipes
A blowpipe apparatus is a scientific instrument used in analytical chemistry and mineralogy for conducting various tests, particularly flame tests and microchemical reactions. It typically consists of a small tube or pipette through which a controlled stream of air or oxygen is blown onto a sample being heated. This stream of air or oxygen enhances the combustion of the sample, allowing the observation of characteristic colors emitted by different elements when they are vaporized and excited by the heat. The blowpipe apparatus is often used to identify and differentiate between different elements and compounds based on their unique emission spectra and reactions.
