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a quantity that has both a number and a unit

measurement

a measure of how close a measurement comes to the actual value of whatever was measured

accuracy

the correct value based on reliable references

accepted value

the value measured in the lab

experimental value

experimental value minus the accepted value

how do you find error

absolute value of error divided by the accepted value multiplied by 100 percent

how do you find the percent of error

all digits that are known plus a last digit that is estimated

significant figures

International System of Unites

SI

meter, kilogram, kelvin, the second, the mole

what are the five units commonly used by chemists

meter

what measures length

liter

what measures volume

kilogram

what measures mass

a force that measures the pull of a given mass by gravity

weight

kelvin and celsius

what measures temperature

calorie

what is energy measured by