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16 Cards in this Set
- Front
- Back
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What is a unit?
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A unique name we assign to measures of a quantity.
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What is a standard?
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Something we compare a measure of each physical quantity in its own units.
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What is a base standard?
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The internationally agreed upon standards which all other physical measures are based upon.
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What is the International System of Units (SI)?
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Seven internationally agreed upon base quantities, thereby forming the basis of the International System of Units, abbreviated SI from its French name and popularly known as the metric system.
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What is a conversion factor?
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A ratio of units equal to 1.
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What is a meter?
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The meter is the length of the path traveled by light in a vacuum during a time interval of 1/299792458 of a second.
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What is a kilogram?
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A platinum–iridium cylinder kept at the International Bureau of Weights and Measures near Paris and assigned, by international agreement, a mass of 1 kilogram.
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What is an atomic mass unit?
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1.6605402 x 10^-27 kg (the mass of one hydrogen atom.
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What are the three base units of SI?
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1. length: m
2. mass: kg 3. time: s |
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What does the prefix "kilo-" mean?
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10^3
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What does the prefix "mega-" mean?
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10^6
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What does the prefix "centi-" mean?
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10^-2
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What does the prefix "milli-" mean?
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10^-3
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What does the prefix "micro-" mean?
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10^-6
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What does the prefix "nano-" mean?
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10^-9
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What does the prefix "pico-" mean?
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10^-12
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