MeasurementMeasurement

The comparison of some The comparison of some aspect of an object or aspect of an object or

phenomenon with a standard phenomenon with a standard unit.unit.

How do you properly measure How do you properly measure something?something?

Use a measuring instrument to determine a Use a measuring instrument to determine a number.number.

The last digit of your number is always The last digit of your number is always estimated.estimated. A proper significant figure included all digits as A proper significant figure included all digits as

read from the instrument plus one doubtful digit.read from the instrument plus one doubtful digit.

How do you properly measure How do you properly measure something?something?

Every number is assigned a unit.Every number is assigned a unit.

International System of Units (SI International System of Units (SI Units)Units)

Standard system of measurement Standard system of measurement used in scienceused in science Examples:Examples:

kilogram, centimeter, kilometer, liter, kilogram, centimeter, kilometer, liter, milligram, millimeter, milliliter, degrees milligram, millimeter, milliliter, degrees CelsiusCelsius

PrefixesPrefixes

Kilo – 1,000Kilo – 1,000 Centi – 1/100Centi – 1/100 Milli – 1/1000Milli – 1/1000

Precision Vs AccuracyPrecision Vs Accuracy

Precision Precision How reproducible a How reproducible a

measurement is.measurement is.

Precision vs. AccuracyPrecision vs. Accuracy

Accuracy Accuracy How correct a How correct a

measurement is.measurement is.

Precision vs. AccuracyPrecision vs. Accuracy