Standards of MeasurementStandard – exact quantity that people agree to use for comparisonMetric System – system of measurement based on multiples of 10SI – International System of Units used and accepted worldwide
Common SI PrefixesPrefix Symbol Multiplying Factordeka- D 10 = 101hecto- H 100 = 102kilo- k 1000 = 103deci- d 0.1 = 10-1centi- c 0.01 = 10-2milli- m 0.001 = 10-3micro- μ 0.000001 = 10-6nano- n 0.000000001 = 10-9
Using SI UnitsQuantity Unit SymbolMeasuredLength Meter mMass Kilogram kgTime Second sElectric Current Ampere ATemperature Kelvin KAmount of Mole molsubstanceIntensity of light Candela cd
Try these temp. conversions: 98.6 º C = ? K 104.38 K = ? º C
Conversion Tips A measurement consists of two parts: a number and a unit label To convert from larger to smaller units: Multiply or MOVE DECIMAL TO THE RIGHT To convert from smaller to larger units: Divide or MOVE DECIMAL TO THE LEFT
Use this Tool:Kilo Hecto Deka Meter (m) Deci Centi Milli(k) (h) (D) Gram (g) (d) (c) (m) Liter (L)
Try these conversions: 1 km = _____________ m 1 m = _____________ cm 25 km = ________ m = _______ cm 55 kL = _______ cL = ________ L
Graphing Graph – a visual display of information or dataUses of Graphs Line Graphs – show trends or how data change over time Bar Graphs – compare information collected by counting Circle (Pie) Graphs – show how a fixed quantity is broken down into parts.