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ml is for milliliters, and measures volume of liquid (how much room the liquid takes up). mg is for milligrams, and measures how much something weighs. So you can't really compare them (if you have 1,000 ml of pancake syrup, that's going to weigh a lot more than 1,000 ml of gasoline).

The only time they are the same is if you're talking about water, since the metric system uses the properties of water as a standard. So one milliliter of water takes up one cubic centimeter and weighs one gram. In that case, your 6ml of water would weigh 6,000mg (6 grams).

If it's not water, you can convert between volume and weight using the 'specific gravity' of a liquid. This is a comparison of how much it weighs compared to water. So if you look up the specific gravity of some liquid, and it's 1.3, then you can take the number of milliliters of the liquid that you have and multiply by 1.3 and that's how many grams it should weigh.

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14y ago

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