Units of MeasurementUnits of MeasurementVolumeTemperatureSlide 5Uncertainty in MeasurementsAccuracy and PrecisionSignificant FiguresSignificant FiguresSignificant FiguresChapter 1 1Units of MeasurementScientific measurements are commonly reported using the International System of Units (SI).Chapter 1 2Units of MeasurementPrefixes convert base units into units that are of a convenient size for the item being measured.Chapter 1 3VolumeA commonly used unit of volume is the liter (L).TemperatureChapter 1 4Chapter 1 5At home you like to keep the thermostat at 72°F. While traveling in Canada, you find the room thermostat calibrated in degrees Celsius. To what Celsius temperature would you need to set the thermostat to get the same temperature you enjoy at home?Chapter 1 6Uncertainty in MeasurementsDifferent measuring devices have different uses and different degrees of accuracy.Chapter 1 7Accuracy and PrecisionAccuracy refers to the proximity of a measurement to the true value of a quantity.Precision refers to the proximity of several measurements to each other.Chapter 1 8Significant FiguresSignificant figure convention is observed so that the value we report represents the precision of our measurements.All nonzero digits in data are significant.Zeros between two other significant digits are significant.Zeros at the beginning of a number are not significant.Chapter 1 9Significant FiguresZeros at the end of a number are significant if the number is written with a decimal point, otherwise they are not.Chapter 1 10Significant FiguresWhen addition or subtraction is performed, answers are rounded to the least significant decimal place.When multiplication or division is performed, answers are rounded to the number of digits that corresponds to the least number of significant figures in any of the numbers used in the