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22 Cards in this Set
- Front
- Back
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a comparison of a dimension of an object or substance to an appropriate standard, usually an instrument with a calibrated scale |
measurement
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Any measurable property of the physical universe.
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dimension
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a known quantity that everyone agrees will be used for comparison when measuring.
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standard
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any artificial device made for the purpose of refining, extending, or substituting for the human senses when measuring.
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instrument
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the subdivision or portion of a dimension assigned a value of 1
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unit
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the spacing of the marks on the instrument.
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calibrated scale
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A system of measurement in which all units of a given dimension are related to each other by powers of 10
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metric system
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The global metric system
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SI
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any factor equal to 1 that consists of a ratio of two units.
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a conversion factor
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The arithmetic difference between a measured value and the actual value of the dimension.
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error
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An evaluation of the measurement error; an indication of how close a measurement is to its actual value.
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accuracy
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An evaluation of how exactly a measurement is made.
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precision
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A digit in a measurement used to communicate the precision of the measurement. These are all the digits known from the instrument scale plus one estimated digit.
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Significant digits (SD)
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A convenient way to express very large or small numbers.
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Scientific Notation
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The measure of the earth's gravity acting on the matter in an object.
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Weight
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A laboratory instrument that measures wight by balancing the pull of the earth's gravity in the object being weighed against the force exerted by a stretched spring inside the instrument.
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spring scale
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A laboratory instrument that measures weight by converting the pull of gravity on an object into an electronic signal that is processed by a computer chip.
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electronic scale
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A simple instrument that compares a known mass to an unknown mass using a lever arm.
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balance
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An electronic instrument that measures the wight of an object and then displays its equivalent mass.
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electronic balance
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The space enclosed or occupied by an object.
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Volume
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The curved surface of a liquid in a container with a narrow neck.
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Meniscus
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The amount of matter or the mass of the substance contained in a specific volumetric unit.
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density
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