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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.
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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 segment of a dimension assigned a value of 1 for measuring purposes
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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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the 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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conversion factor
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the mathematical difference between the measured value and the actual value.
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error
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evaluates how close a measurement is to the actual value
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accuracy
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evaluates 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. The digits are all the known digits plus one that is estimated.
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significant digits (SD)
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A more convienient way of writing large or small numbers.
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scientific notation
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can indicate the amount of matter in an object, but does not measure the amount of matter directly.
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weight
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balances the pull of the earth's gravity on an object being weighed against the pull of a spring inside the instrument.
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spring scale
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measures weight by converting the pull of gravity on an object into an electronic signal that is processed by a computer chip. The weight is displayed on a digital screen.
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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. When balanced, the weight of the known mass equals the weight of the unknown mass.
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balance
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An electronic instrument that measures the weight 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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a property of matter that can be used to identify certain kinds of matter, expecially pure substances.
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Density
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