Measure of Volume
In some countries, a teaspoon full (also "teaspoonful") is a unit of volume, especially in cooking recipes and pharmaceutic prescriptions. In English it is abbreviated as t., ts., tsp. or tspn. ), never capitalized, as capitals are customarily reserved for the larger tablespoon ("T." or "Tbls." or "Tb."). In German and Dutch teaspoon is abbreviated TL, for Teelöffel and Theelepel respectively.
As an unofficial but once widely used unit of Apothecaries' measure, the teaspoon is equal to 1 fluid dram (or drachm) and thus of a tablespoon or of a fluid ounce. The Apothecaries' teaspoon (formerly tea spoon or tea-spoon) was formally known by the Latin cochleare minus, abbreviated cochl. min. to distinguish it from the tablespoon or cochleare majis (cochl. maj.).
When tea-drinking was first introduced to England circa 1660, tea was rare and expensive, as a consequence of which teacups and teaspoons were smaller than today. This situation persisted until about 1710, when the East India Company began importing tea directly from China. As the price of tea declined, the size of teacups and teaspoons increased. By the 1730s, the teaspoon as a unit of culinary measure had increased to of a tablespoon, but the apothecary unit of measure remained the same. Nevertheless, the teaspoon, usually under its Latin name, continued to be used in Apothecaries' measures for several more decades, with the original definition of one fluid dram.
In the United States one teaspoon as a unit of culinary measure is tablespoon, that is, ~4.93 mL; it is exactly 1 U.S.fl. drams U.S. fl. oz, cup, and U.S. liquid gallon (see United States customary units for relative volumes of these other measures) and approximately cubic inch.
For nutritional labeling on food packages in the U.S., the teaspoon is defined as precisely 5 mL
Common teaspoons are not designed to contain a standard volume. In practice, they may hold anything between 2.5 mL and 6 mL of liquid, so such spoons are not suitable for precise measurements, in particular for medicine.
If a recipe calls for a level teaspoonful of a dry ingredient (salt, flour, etc.), this refers to an approximately levelled filling of the spoon, producing the same volume as for liquids.
A rounded teaspoonful is a larger but less precise measure, produced without levelling the ingredient off nor heaping it as high as possible.
A heaping (American English) or heaped (British English) teaspoonful is a larger inexact measure, equal to the most that can be obtained by scooping the dry ingredient up without levelling it off. For some ingredients, e.g. flour, this quantity can vary considerably.
When no particular type of teaspoonful is specified for a dry ingredient it may mean a level or a rounded spoonful, never a heaping/heaped one.
Read more about this topic: Teaspoon
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