With water it's easy. 1 cm3 of pure water equals 1 gram. With everything else, you need to know the density. Then use the formula density = mass / volume.
Re-write the formula as mass = density x volume.
The unit of density is g/cm3 - so you need not convert the units.
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Since there are 1,000 cubic centimeters to one liter, 66.3 liters = 66,300 cubic centimeters.
Volume cannot be measured in grams per cubic centimetres, density can.
Note: You cannot convert cubic to squared - you convert cubic metric to cubic imperial. 1 inch = 2.54 centimetres, so 1 cubic inch = 2.54 x 2.54 x 2.54 = 16.387064 cubic centimeters. Therefore to convert a number of cubic centimetres into cubic inches you divide it by 16.387064 For example 123 cubic centimetres = 123 ÷ 16.387064 = 7.5 cubic inches, rounded to one decimal place.
To convert milligrams (mg) to cubic centimeters (cc), you need to know the density of the substance in question. Without this information, a direct conversion is not possible. The relationship between milligrams and cubic centimeters varies depending on the substance's density.
For solids and liquids, if you know the density in grams per cubic centimeter, and the atomic mass (grams per mole), then you can calculate it. Moles * (atomic mass) / (density) = volume. For gasses: you need to know the Pressure and Temperature, and use PV = nRT, so V = n*R*T/P, then convert to cubic centimeters. Or if at Standard Temperature and Pressure (0°C and 1 atmosphere), an Ideal Gas has a volume of 22.4 liters/mole (22400 cm3 / mole)