Units Of Measurement. I.Units of Measurement A.What measurement system is used in all disciplines of science? 1.WHY? B.Base Units QuantityUnitAbbreviation.

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Presentation transcript:

Units Of Measurement

I.Units of Measurement A.What measurement system is used in all disciplines of science? 1.WHY? B.Base Units QuantityUnitAbbreviation LengthMeterm MassKilogramkg TimeSeconds TemperatureKelvinK Electric CurrentAmpereA Amount of SubstanceMolemol Luminous IntensityCandelacd

C.Metric System prefixes: PrefixSymbolMeaningMultiple kilokthousand1000 hectohhundred100 dekadaten10 PrefixSymbolMeaningMultiple decidtenth0.1 centichundredth0.01 millimthousandth0.001 Greater Than One Smaller Than One In between:meter - length gram - mass liter - volume

Use the following for metric conversions: In between:meter - length gram - mass liter - volume 1 giga = 1,000,000,000 1 mega= 1,000,000 1 kilo = hecto = deca = deci = centi = milli = 1 1,000,000 micro (µ) = 1 1,000,000,000 nano (n) = 1

D.Accuracy and Precision 2.Precision – How accurately something is measured. 1.Accuracy – How close a measurement is to the actual value. Accuracy And Precision Good Accuracy Good Precision Poor Accuracy Poor Precision Poor Accuracy Good Precision Good Accuracy Poor Precision

E.Scientific Notation 1.A way to express very large or very small numbers 265, x HOW a.1. Find the decimal b.Count Positive (Number is greater than one.) Negative (Number is less than one.)

1.1,800,000, , ,000, ,555, , ,000, , ,000, X X X X X X X X X X X X X X 10 -8

How to make metric measurements

1cm cm Measure using centimeters.

1cm cm Measure using centimeters.

1cm cm Measure using centimeters.

1cm cm Measure using centimeters.

1cm mm Measure using millimeters.

1cm mm Measure using millimeters.