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One teaspoon of liquid equals 5 ml, meaning 1 ml equals one-fifth of a teaspoon. There are 1,000 ml in one liter of liquid.

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One teaspoon is about equal to 5 milliliters. Technically a teaspoon is equal to about 4.93 milliliters, so 5 milliliters equals 1.01 teaspoons. However, for the nutritional labeling on food packaging in the United States, it is defined as exactly 5 milliliters.

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There are three teaspoons in a tablespoon. That means that there are 1.5 teaspoons in a 1/2 tablespoon, and 1/3 of a tablespoon is a single teaspoon.

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Ninety milliliters equals approximately 6 metric tablespoons. A single metric tablespoon is equal to 15 milliliters.

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Since 3 teaspoons make 1 tablespoon, and 2 tablespoons make 1 fluid ounce, 1 ounce is equivalent to 6 teaspoons. Care must be taken to distinguish between measurements of weight and volume in this case, as dry ounces and liquid ounces measure weight and volume, respectively.

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When measuring the volume of water, there is one milliliter in a gram. This may vary for other liquids, but the standard substance in volume-to-mass conversion is water.

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The number of grams present in a teaspoon depends on what is being measured. Different substances provide different results.

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According to the Southern Food Expert of About.com, one gram equals .21 teaspoons. Conversely, this means one teaspoon equals approximately 4.76 grams when you need to compare.

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One CC, or cubic centimeter, is equal to one mL, or milliliter. Both terms are part of the metric system and are used as measurements of volume.

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An eighth of a teaspoon is usually regarded in culinary measurements as .5 milliliters and is called a pinch. The United States customary unit for a teaspoon is equivalent to a third of a tablespoon, 4.928921599375 milliliters, 1/6 of a U.S. fluid ounce or 1/48 of a U.S. cup.