PCC CH 100  Unit Conversion Process (3 pages)
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Unit Conversion Process
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 Portland Community College
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 Ch 100  Everyday Chemistry with Lab
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CH100 Fundamentals for Chemistry Unit Conversion Process 1 of 3 Instructor Tony Zable In chemistry converting units from one unit system to another especially within the Metric system can appear daunting at first glance However with a little guidance and a lot of practice you can develop the necessary skill set to master this process To begin here is a simple mnemonic to guide you through the unit conversion process 1 Eliminate 2 Replace 3 Relate All unit conversions regardless of how complex they appear involve these 3 simple steps In the following sections you will be stepped through the unit conversion process using these 3 words as a guide Example How many can 25 2 miles hour be expressed in m s Note It is important to recognize that 25 2 i e 25 2 miles m hour s miles 25 2 miles hour 1 hour Let s breakdown the unit conversion process into 2 individual processes miles to meters and hours to seconds 1 Eliminate the unit s you begin with must be eliminated in a mathematically consistent manner If a unit to be eliminated is a numerator unit it must be divided out m 25 2 miles s 1 hour miles If a unit to be eliminated is a denominator unit it must be multiplied out m 25 2 miles hour s 1 hour 2 Replace the desired unit s you end up with must replace the original unit in a mathematically consistent manner If a unit to replace is a numerator unit it must be multiplied in m 25 2 miles m s 1 hour miles If a unit to be eliminated is a denominator unit it must be divided in m 25 2 miles hour s 1 hour s CH100 Fundamentals for Chemistry Unit Conversion Process 2 of 3 Instructor Tony Zable 3 Relate the units must be related to each other in some mathematical expression Identify the relationship between the starting and final units 1 mile 1609 m 1 hour 3600 s To take the guess work out of where the values should go match the value with its corresponding unit For the distance conversion m 25 2 miles 1609 m s 1 hour 1 mile For the time conversion m 25 2 miles 1 hour s 1 hour 3600
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