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Conversion table for the pinch and their metric and US customary equivalents 1 pinch An amount of a solid occupying an amount of space that can accommodate 15 minims ( 1 / 4 fluid drachm or 1 / 32 fluid ounce) of liquid 1 / 2 salt spoon or 1 / 4 teaspoon
Conversions between units in the metric system are defined by their prefixes (for example, 1 kilogram = 1000 grams, 1 milligram = 0.001 grams) and are thus not listed in this article. Exceptions are made if the unit is commonly known by another name (for example, 1 micron = 10 −6 metre).
Metric signs and metric measurements were removed for the 2009 edition and replaced with an appendix of metric conversion tables. This is in marked contrast to the position in the (largely metric) United Kingdom , where metric road signs are prohibited by law (except for those denoting widths and height restrictions, which include both metric ...
Today's US teaspoon is equivalent to exactly 4.92892159375 ml, which is also 1 ⁄ 6 US fluid ounces, 1 + 1 ⁄ 3 US fluid drams, [5]: C-18 or 80 US minims. [5]: C-5 C-5 While pharmaceuticals are measured nowadays exclusively in metric units, fluid drams are still used to measure the capacity of pill containers .
Metric units are units based on the metre, gram or second and decimal (power of ten) multiples or sub-multiples of these. According to Schadow and McDonald, [ 1 ] metric units, in general, are those units "defined 'in the spirit' of the metric system, that emerged in late 18th century France and was rapidly adopted by scientists and engineers.
1 UK pinch = 1 / 16 UK tablespoon = 1 / 8 UK dessert spoon = 1 / 4 UK teaspoon = 1 / 2 UK salt spoon: ≈ 0·06: US customary tablespoon: ≈ 0·09: US customary dessert spoon
Conversion of units is the conversion of the unit of measurement in which a quantity is expressed, typically through a multiplicative conversion factor that changes the unit without changing the quantity. This is also often loosely taken to include replacement of a quantity with a corresponding quantity that describes the same physical property.
The metric measures in brackets in the above table are not from the original document but are conversions into kilograms for clarity. Millier: [ French > mille = “a thousand”] 1) A unit of a thousand. 2a) A metric ton. 2b) A thousand kilos. 2c) A million grams.