You do not.
A milligram is a measure of mass. A millilitre is a measure of volume. The two measure different things and, according to basic principles of dimensional analysis, conversion from one to the other is not valid.
If you are not convinced, consider 4 milligrams of air. How many millilitres? Next consider 4 milligram Mercury. How many millilitres?
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To convert 4mg to 1mL, you need to know the concentration of the substance you are working with. If the concentration is 1mg/mL, then 4mg is equivalent to 4mL. If the concentration is different, you can use the formula Concentration (mg/mL) = Amount (mg) / Volume (mL) to calculate the conversion.
This is not a valid conversion; milligrams (mg) and grams (g) are measures of weight or mass while milliliters (mL or ml) measure volume.
To convert 1 fluid ounce (fl oz) to milliliters (ml), you can use the conversion factor that 1 fl oz is approximately equal to 29.5735 ml. So, 1 fl oz is roughly equivalent to 29.5735 ml.
To convert from micrograms per gram (ug/g) to nanograms per milliliter (ng/mL), you need the density of the substance in grams per milliliter. Once you have the density, you can multiply 7 ug/g by the density to convert to ng/mL because 1 ug = 1000 ng and 1 g = 1 mL.
1 teaspoon would contain approximately 5mg of the drug.
To convert milliliters (mL) to milligrams (mg) for water, it would be a 1:1 conversion where 1 mL of water is approximately equal to 1 mg. Therefore, the mass of 538 mL of water would be approximately 538 mg.
To convert milliliters (mL) to liters (L), divide the amount in milliliters by 1000. For example, 500 mL is equal to 0.5 L (500 mL / 1000 = 0.5 L).