A type of chemical laboratory equipment. A flat-bottomed, cylindrical container with a wide opening and a spout for pouring liquids. It is used to perform operations such as separating liquids, preparing solutions, heating, cooling, stirring, and forming precipitates. There are microbeakers with a capacity of a few milliliters, as well as large beakers with a capacity of over 10 liters, and they are used according to the scale of the experiment. Beakers with a narrow opening compared to their height are called tall beakers, and those with a narrow cylindrical section toward the top are called conical (triangular) beakers. Thin-walled hard glass beakers are generally used, but beakers made of colored glass, quartz glass, porcelain, platinum, enamelware, polyethylene, fluororesin, and other materials are used depending on the purpose. Beakers with volumetric graduations are guide graduations and not graduations for measuring containers. [Iwamoto Shinbu] [Reference] |Source: Shogakukan Encyclopedia Nipponica About Encyclopedia Nipponica Information | Legend |
化学実験器具の一つ。平底円筒形で開口部が広く、液体の注ぎ口がある容器。液体の分取(ぶんしゅ)、溶液の調製、加熱、冷却、攪拌(かくはん)(かきまぜ)、沈殿生成などの操作を行うのに用いられる。容量数ミリリットルのミクロビーカーから10リットルを超える大形ビーカーがあり、実験の規模に応じて使用する。高さに比べて口径が細いものをトールビーカー、上部に向かって円筒部が細くくびれたものをコニカル(三角)ビーカーとよぶ。一般には薄肉硬質ガラス製のものを使うが、着色ガラス、石英ガラス、磁器、白金、ほうろう鉄器、ポリエチレン、フッ素樹脂などの材質のビーカーが用途に応じて使われる。容量目盛りのつけられたものは目安目盛りであり、測容器としての目盛りではない。 [岩本振武] [参照項目] |出典 小学館 日本大百科全書(ニッポニカ)日本大百科全書(ニッポニカ)について 情報 | 凡例 |
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