Laboratory flask
Laboratory flasks are containers made of glass which are usually used in scientific laboratories. Flasks are made in different shapes and sizes. Their size are chosen by the volume they can hold, and is measured in metric units, like leters (L) or mililiters (mL). Their shape depends on what they are used for, but they usually consist of a body which contains the materials, and a neck which is they way to insert materials into the body. Some modern flasks are made of plastic.
There are many different types of laboratory flasks. They differ in their shape and what they are used for. Examples are:
Flasks can be used to make and hold solutions, to measure chemicals, and to contain chemical reactions like boiling, precipitation and analysis.
There are several types of laboratory flasks, all of which have different functions within the laboratory. The most common types of flask are:
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Erlenmeyer flask or conical flask.
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Round-bottom flask — a flask with a round body and one or more necks with ground glass joints.
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Retort — a round vessel with a long downward-pointing neck.
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Florence flask — a flask with a round body and one longer neck without a ground glass joint.
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Büchner flask or sidearm flask — a flask with thicl walls and a short tube for connection of a hose on the side of its neck.
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Volumetric flask — a flask used for preparing liquids in very precise volumes. It is a flask with a pear-shaped body and a long neck with a line on it which marks the standard volume it can contain.
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Dewar flask — a flask with which is used to hold a vacuum.
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