To convert milligrams to teaspoons, you need to know the density of the substance you are measuring. Assuming you are talking about water, which has a density of 1 gram per milliliter, you can use the conversion factor that 1 milliliter is approximately equal to 0.20288 teaspoons. Therefore, 12.5 milligrams of water would be approximately 0.0025 teaspoons.
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