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29 Cards in this Set
- Front
- Back
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MEASUREMENTS
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THE ACT OF COMPARING AN UNKNOWN QUANTITY TO A STANDARD UNIT
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DIMENSION
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Any measureable property of the physical universe. Examples include length, mass, time, volume, and temperature
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UNIT
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A label such as "inches" or "meters" used to specify the terms in which a measurement is being reported.
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SCALE
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A means of measuring. A scale is subdivided into measureing units.
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CALIBRATE
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To accurately subdivide into measuring units
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INSTRUMENT
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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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SI
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The standard metric system used by research scientists worldwide. it includes 7 base units--length, mass, time, temperature, number of particles, electric current, and light intensity.
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BASE UNIT
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Seven units in the SI, each of which measures a basic dimension., from which all other metric dimensional units are derived, for example, meter, kilogram, second, kelvin, mole, ampere, and candela.
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DERIVED UNIT
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Any mathematical combination of the base units. The SI contains only 22 derived units, for example, square meter, cubic meter, hertz, and joule.
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UNIT CONVERSION
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Multiplication of a uit by a conversion factor
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ACCURACY
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A numerical evaluation of how close a measurement is to an accepted reference or theoretical value. ; the measurement of error.
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PERCENT ERROR
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A quantity that derives from a method that compares the magnitude of the measurement error with the size of the measurement.
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PRECISION`
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The agreement between two or more measurements. A quantitative evaluation of the exactness of a measurement.
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ANALOG INSTRUMENT
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A nondigital metric instrument that measures by comparing the object or phenomenon being measured directly to a scale..( as in a ruler or dial) . or displays the reading using a ppointer against a scale ( as in a triple beam balance)
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digDIGITAL INSTRUMENT
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a measuring instrument that has a display consisting of only numerical digits ... as in a thermometer
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DATA
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Information collected through observation. any recorded observation that is a detailed description or measurement
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SD...SIGNIFICANT DIGIT
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The digits in the numerical value of a measurement that indicate its precision. the significant digits consist of all the certain digits plus one estimated digit.
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What is it called when scientists quantify thier observatios of their surroundings?
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the term for quantifying observations is MEASUREMENT
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What are two required components for every measurement?
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Every measurement must have a numerical factor and a dimensional unit
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What is the first step in creating a unit conversion factor?
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The first step in creating a unit conversion facot is to write an equation relatig two equivalet quantities.
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Why should you not use the term PERCENT to indicate a portion of a larger quantity?
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The term PERCENT is properly used as a unit associated with a number meaning "parts of 100".
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a liquid thermometer is an example of what kid of instrument display?
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analog instrument
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What are the significant digits in a measurment?
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all the digits that are know for certain from reading an instruments scale, PLUS ONE ESTIMATED DIGIT.
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What is the only reliable way to report correct significant digits in a measurement that contains trailing zeros?
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to write the measurement in scientific notation.
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T/F... A scientific measuring instrument requires some kind of calibrated scale
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true
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T/F...The main function of bridge notation is to check that you accurately key the calculation into your calculator.
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FALSE... Bridge notation is best used to aid in setti up a problem calculation and checkin unit calculation,
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T/F... Percent error is sometimes used to quantify the accuracy of a measurement or answer
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TRUE
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T/F... The precision of an instrument is the measure of its accuracy
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FALSAE... an instruments precision is a quantitative evaluation of how exactly it can indicate a measurement. it says nothig of how accurate the instrument is.
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symbol for gold
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au
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