The cooking measurement of one teaspoon is a volume measurement and cannot be converted into weight unless you name the material that is being measured. A teaspoon of Mercury would be much heavier than a teaspoon of flour.
One US teaspoon = 4.9 milliliters or 0.17 US fluid ounces (1/6 of an ounce)
Six teaspoons = 1 US fluid ounce
For water: one fluid ounce is approximately equal to one ounce by weight.
One teaspoon of water is approximately equal to 1/6 ounce by weight.
Remember, these figures only apply to water.
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