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The metric system has just one unit for mass: the gram (g). Kilo- is a prefix that means 1000, so a kilogram (kg) is 1000 grams. This way you can go to extremely large and small masses without using any other units. All you need is some prefixes.

A meter (m) is a unit of length, not mass.

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βˆ™ 12y ago
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βˆ™ 4mo ago

Kilograms (kg), grams (g), and milligrams (mg) are all units of mass in the metric system. They are all related by powers of 10 - 1 kg = 1000 g = 1,000,000 mg. These three units allow for easy conversion between different scales of mass.

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Q: Why does kg g and m need 3 units in mass?
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What are the correct units for mass and density?

The correct units for mass are kilograms (kg) and for density are kilograms per cubic meter (kg/m^3).


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The units for density are typically expressed in mass divided by volume, such as kilograms per cubic meter (kg/m^3) or grams per cubic centimeter (g/cm^3).


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How many kilograms are in 378.74 mg?

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What is the density of an object with a mass of 60.0g and a volume of 234cm?

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What does 3 kg equal in gallons?

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How many kilograms are in 5625 grams?

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What is the Density of a material that has a Mass of 10 Kg and a Volume of 0.5 cubic Meters?

The density of the material is calculated by dividing the mass (10 kg) by the volume (0.5 cubic meters). Therefore, the density of the material is 20 kg/cubic meter.