Technically you could use any unit of mass and any unit of volume and the value you'd get would still be density. For solids milliliters are often replaced with cubic centimeters, though in this case they are the same thing. It is not uncommon to express density, especially of a gas, in terms of kilograms per cubic meter.
However, if you use different units, you will arrive at a different number. For example water has a density of about 1 gram per milliliter, which is the same as 1,000 kilograms per cubic meter.
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1 kilogram = 1000 grams Density = grams/milliliters 1.25744 = 1000 grams/ml = 795.267 milliliters which is... 0.795267 Liters
density = mass/volume You need to know that mass will be measured in some form of gram, such as grams, milligrams, or kilograms. Volume will typically be measured in milliliters, liters, cubic centimeters, or cubic meters.
No, 750 milliliters (mL) and 750 grams (g) are not the same. Milliliters measure volume, while grams measure mass. The relationship between the two depends on the density of the substance being measured. For water, 750 mL is approximately equal to 750 grams because the density of water is close to 1 gram per milliliter.
Density = mass/volume, so:36 grams/ 12 milliliters3 grams/ milliliter
Density = Mass/Volume = 150g/50mL = 3 grams per millilitre.