Q:

What is the mathematical formula for mass?

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Quick Answer

The mathematical formula for mass is mass = density x volume. To calculate the mass of an object, you must first know its density and its volume.

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What is the mathematical formula for mass?
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Full Answer

The formula "mass = density x volume" is a variation on the density formula: density = mass ÷ volume. As long as two of the variables are known, the third can be calculated by rearranging the equation. In order to calculate mass, it is necessary to divide both sides of the density equation by volume.

For example, to find the mass of a liter of milk, it is first necessary to know the density of the milk. If the density is 1.03 g/mL, then according to the equation, the mass of one liter of milk is 1.030 kilograms.

Mass is often confused with weight, although they are two different things. Mass is an unchanging quality of an object. Relativistic mass, however, can increase when an object approaches light speed. It is a measurement of the amount of matter the object has. When a physicist discusses the mass of an object, he or she is is talking about the number of particles in the object, not how much they weigh. Weight, on the other hand, is the force of gravity pulling on a mass. The SI unit of mass, as determined by the International System of Units, is the kilogram.

Density is how much mass there is in a given amount of a material. An object of higher density will weigh more than an object of lower density, even if the objects are the same size.

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Related Questions

  • Q:

    What is the unit of density?

    A:

    Density it the relationship between the volume and mass of a substance. Specifically, it is found by dividing the mass by the volume. The unit of density depends upon which units are used to measure mass and volume.

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  • Q:

    How do you use mass (in mg) to determine volume occupied?

    A:

    To use the known mass of a substance to calculate the volume occupied by that substance, divide the mass by the density of the substance. The units in which density is expressed must be the same as those used to measure mass and the volume.

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  • Q:

    How is density measured?

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    Density is measured by an object’s mass to volume ratio. The formula, which is expressed as density=mass/volume, quantifies how much matter is packed into the underlying object or space. Density is often measured in kilograms per cubic meter.

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  • Q:

    How many milligrams are in a teaspoon?

    A:

    There is no direct conversion between these measurements because a milligram is a measure of mass and a teaspoon is a measure of volume. However, there are 0.00018 teaspoons in 1 milligram of salt, so 1 milligram divided by 0.00018 teaspoons equals about 5,555 milligrams per teaspoon of salt.

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