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Base Units

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Standard units of measurement from which all other measurements can be determined; include meter, liter, gram.

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Density

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An object's mass divided by its volume; a measure of how many particles are packed together into a certain amount of space.

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Length

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A measure of distance from one point to another in a straight line.

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Mass

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The amount of matter in an object.

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Measure

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To use a tool to learn more about the volume, length, or weight of an object.

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Metric Prefixes

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A unit that comes before a base unit to show a multiple or subdivision of the base unit; e.g., kilo-, centi-, milli-.

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Metric System

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A system of measurement based on multiples of 10.

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SI System

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The International System of Units that uses 7 base units which are used worldwide by the scientific community.

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Temperature

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A measure of the average kinetic energy of the atoms in a system, used to express thermal energy in degrees.

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Time

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The measurement used to quantify the duration of events; measured in seconds (s).