Teaspoon (Metric): in the metric system, the teaspoon is not a standardized unit of volume. The metric system primarily uses the liter and its subunits, such as milliliters, for measuring volume. However, in culinary contexts, especially in recipes, people might refer to a "teaspoon" for convenience, as 1 metric teaspoon is often considered to be roughly equivalent to 5 milliliters.
Ounce (Imperial): unit of volume refers to the imperial fluid ounce, which is part of the imperial system of measurement. The imperial fluid ounce is slightly smaller than its U.S. counterpart and is equal to 28.413 milliliters.
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