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# What is mass in science?

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### Quick Answer

In science, mass is the amount of matter an object has. Newton's second law says that mass is the property of matter that determines the force required to impart a given acceleration to an object.

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### Full Answer

Mass will always be a fixed quantity. Mass is not the same thing as weight. If one takes something with the mass of 5 kilograms to the moon, the mass does not change, even though the weight is only 1/6 of what it is on the Earth. The standard measurement used for this fixed quantity is always kilograms. The kilogram is an internationally recognized measurement for mass.

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## Related Questions

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Anything that has mass and volume is called matter. There are four classical states of matter: solid, plasma, liquid and gas. Each type of matter has different properties.

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The most common way to measure the mass of an object in grams is to use a scale or balance. Techniques vary but are generally similar to measuring weight. In a laboratory setting, more sophisticated measurement instruments such as analytical balances are used.

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To convert lbm (pound-mass) to lbf (pound-force) for an object located at the Earth's surface, multiply the mass (in pounds) by the "standard gravitational force" of 32.174049 (typically rounded to 32.174) to calculate lbf. If the object is not located at the Earth's surface, a different ratio must be used.

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In order to convert milligrams to milliliters, one must know the density of the substance; if the density is measured in milligrams per milliliter, the milligrams of mass of the object being measured are divided by the density of the substance to determine the volume in millimeters. Because density is generally not listed in milligrams per milliliter, it is likely that some calculations must be done to convert the density into the appropriate units.

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