To determine the volume in milliliters (mL) corresponding to a given mass in milligrams (mg), we need to know the density of the substance. Density is defined as mass divided by volume, or D = m/V.
Without knowing the substance, we cannot directly convert milligrams to milliliters. However, if we assume that the substance has a density of 1 g/mL (which is approximately true for water), then we can make an estimation.
Since 1 gram (g) is equal to 1000 milligrams (mg), we can say that 1 mL is approximately equal to 1000 mg. Therefore, we can use the following conversion:
250 mg * (1 mL / 1000 mg) = 0.25 mL
So, if we assume the density is 1 g/mL, 250 mg would be approximately equal to 0.25 mL. However, please note that this conversion is only valid if the substance in question has a density close to 1 g/mL.