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A teaspoon (tsp.) is a small spoon that can be used to stir a cup of tea or coffee, or as a tool for measuring volume. [1] [2] The size of teaspoons ranges from about 2.5 to 7.3 ml (about 0·088 to 0·257 imperial fluid ounce or 0·085 to 0·247 US fluid ounce).
Conversely, the ton used in specifying tonnage and in freight calculations is often a volume measurement rather than a mass measurement. In US cooking, dry and liquid measures are the same: the cup, the tablespoon, the teaspoon. US dry measures are 16.36% larger than US liquid measures.
In the 18th century, the table-spoon became an unofficial unit of the apothecaries' system of measures, equal to 4 drams ( 1 / 2 fl oz, 14.8 ml). It was more commonly known by the Latin name cochleare majus (abbreviated cochl. maj.) or, in apothecaries' notation, f℥ss or f℥ß (fluid ℥, i.e. ounce, semis, one-half). [13] [14] [15]
The minim was defined as one 60th of a fluid dram or one 480th of a fluid ounce. [5] This is equal to about 61.6 μL (U.S.) or 59.2 μL (Britain). 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 medicine, a finger tip unit (FTU) is defined as the amount of ointment, cream or other semi-solid dosage form expressed from a tube with a 5 mm diameter nozzle, applied from the distal skin-crease to the tip of the index finger of an adult.
For Da/ent to be exactly equal to g/mol, the dalton would need to be redefined exactly in terms of the (fixed-h) kilogram. Then, in addition to the identity g = (g/Da) Da, we would have the parallel relationship mol = (g/Da) ent = N 0 ent, conforming to the original mole concept—that the Avogadro number is the gram-to-dalton mass unit ratio.
The optic cup is the white, cup-like area in the center of the optic disc. [1] The ratio of the size of the optic cup to the optic disc (cup-to-disc ratio, or C/D) is one measure used in the diagnosis of glaucoma. Different C/Ds can be measured horizontally or vertically in the same patient. C/Ds vary widely in healthy individuals.