measurements
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| something that has magnitude, size, or amount | quantity
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| size of a quantity determined by a measurement process and described by both a number and a unit | magnitude
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| compare what is to be measured with a previously defined size | units of measurement
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| the choice of unit depends on | the quantity being measured
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| single measurement system agreed on by scientists all over the world | SI system
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| some non-SI units are still used by __ | chemists
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| objects or natural phenomena that are of constant value, easy to preserve, easy to reproduce and practical in size | standards of measurement
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| standards are used to __ | compare
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| basic quantities measured in arbitrary units established by international agreement | fundamental quantites
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| used in measuring fundamental quantities | SI base units
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| the distance between 2 points OR the path traveled by light in a vacuum during a time interval | length
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| the amount of matter in a body | mass
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| duration of an event OR vibrations of Cesium 133 | time
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| degree of hotness or coldness of an object | temperature
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| amount of substance | mole
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| combinations of fundamental quantites so that combinations of units are produced | derived units
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| how do you convert from C to Kelvin? | add 273 to the C
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| used to figure out the # of atoms or molecules in a given amount of substance | mole
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| number of units or fraction of a unit each line on the scale stands for | calibration
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| what is the percent error formula/ | %E= Value a- Value e/Value a
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| since most objects___ expand as the temperature increases, the volume ___ | expand; increases
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| as volume ___ density ___ | increases; decreases
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| good measurements are both ___ and ___ | accurate and precise
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| refers to the closeness of measurements to the correct or accepted value of the quantity measured | accuracy
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| what does accuracy depend upon? | 1. how carefully the measurement is done 2. quality of the instrument (in working order/well made) 3. one measruement or the average of one measurement as compared to the accepted value
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| what is accuracy determined by? | percent error
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| value accepted comes from ___ | books or tables
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| value experimental comes from | the experiment or measurement in lab
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| the numerator of the percent error formula is called ____ | absolute error
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| refers to the closeness of a set of the same quantity made in the same way | precision
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| what does precison depend upon? | 1. skillful estimation (your guess) 2. number of divisions in the instrument (calibration) 3. how close several measurements are to each other.
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| one way to look at precison | standard deviation
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