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They commonly come in 1, 2, 3, and 5 ml which comes with a specific drop size of 10, 20, 25, 35, and 50 μL. [7] The volumes are usually marked on the stem, though the markings are rather crude and are not particularly accurate. [8] A plastic dropper is relatively inexpensive and disposable, so they are often used to avoid cross-contamination.
Pharmacists have since moved to metric measurements, with a drop being rounded to exactly 0.05 mL (50 μL, that is, 20 drops per milliliter). In hospitals, intravenous tubing is used to deliver medication in drops of various sizes ranging from 10 drops/mL to 60 drops/mL.
Depending on the application, they may be constructed from glass or plastic, [5] in a wide range of volumes. [6] The mouth of the Erlenmeyer flask may have a beaded lip that can be stoppered or covered. Alternatively, the neck may be fitted with ground glass or other connector for use with more specialized stoppers or attachment to other apparatus.
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Refill liquids are often sold in the size range from 15 to 30 ml. [160] E-liquids are frequently sold in dropper bottles. [161] One cartridge may typically last as long as one pack of cigarettes. [162] A refill bottle can contain up to 100 mg/ml of nicotine, [159] which is meant to be diluted before use. [163]
Disposable plastic "microlitre tubes" of 0.5ml to 2ml are commonly used in microcentrifuges. They are molded from a flexible transparent plastic similar to polythene, are semi-conical in shape, with integral, hinged sealing caps. Larger samples are spun using centrifuge bottles, which range in capacity from 250 to 1000 millilitres.
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