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# Ch3 - Measurements and Calculations Units/Dimensions...

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1 Measurements and Calculations Units/Dimensions Chapter 3 § English System feet, pounds, °F we won’t use these § Metric System ° C, K, grams , metres, litres § Scientific Data - primarily metric -also use SI units (systeme international) eg: joules, K

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2 Base Units o C K degree Celcius Kelvin temperature s second time m metre length L litre volume g gram mass Abbreviation SI Unit Quantity
3 Units / Dimensions § Equivalence Statement -relates one unit to another 1.00 metre = 100. cm 1 inch = 2.54 cm § Conversion Factors - relates one unit to another as a ratio for use in mathematical operation How many cm are in 3.75 metres? or metres 1.0 cm 100.0 100.0cm metres 1.00 3.75cm m 1.00 cm 100.0 x metres 3.75 =

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4 Dimensional Analysis § A problem solving technique using the units as a guide -use the units in calculations -identify the given information, number and units -identify the units required for the correct answer -set up equivalence statements and or conversion factors -do the math, cancel out units where possible If the solution has been set up correctly, the correct units should be generated in the process.
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Ch3 - Measurements and Calculations Units/Dimensions...

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