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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.
The deposit gave consumers an incentive to return the bottle and "defrayed the cost of the bottle when it was not returned". [1] The Great Depression and "materials shortages" during World War II made the deposit system common for milk, beer, and soda bottles. [1] By 1947, bottle loss in the United States decreased to about 3 to 4%. [1]
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.
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An Erlenmeyer flask, also known as a conical flask (British English) [1] or a titration flask, is a type of laboratory flask with a flat bottom, a conical body, and a cylindrical neck. It is named after the German chemist Emil Erlenmeyer (1825–1909), who invented it in 1860.
In 1973, DuPont engineer Nathaniel Wyeth patented Polyethylene terephthalate (PET) bottles, the first plastic bottle to withstand the pressure of carbonated liquids. [14] Today, PET plastic has replaced glass as the preferred material for single-serving bottled water containers due to its light weight and resistance to breaking. [15] [16] [17]
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