Precision, Uncertainty and Accuracy Not very precise!

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Presentation transcript:

Precision, Uncertainty and Accuracy Not very precise!

Precision, Uncertainty and Accuracy +/- 0.1 g +/ g +/ g

Very Precise (Analytical) Balance Uncertainty = +/ g

Precision -The number of significant digits to which a value has been reliably measured. -The more decimal places, the more precise the measurement. -The greater the precision, the less the uncertainty.

Uncertainty -How much a measurement from an instrument can vary during a measurement. -Usually expressed as +/- ( eg / g means the measured mass could be between and g.) -The smaller the uncertainty, the more precise the measurement -Readings must be written to the number of dec. places which reflect the uncertainty of the instrument. ( eg would be OK for a balance with an uncertainty of +/ g or would be OK for a balance with an uncertainty of +/ g)

Accuracy The accuracy of a measurement is how close the measurement is to an accepted standard. (eg. a “standard” or “calibration” weight which comes with a new balance)

Significant Digits (Figures) The number of significant digits in a measurement is the number of certain digits plus one more (with some uncertainty) For the measurement g Certain digitsUncertain This measurement has ____ significant digits.