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Unformatted text preview: label method.
Solve problems involving density. Conversion Factors. The factorlabel method (also called dimensional analysis) is a simple but
powerful technique that can be applied to a great variety of calculational problems. In this method the units
(labels) of the quantities involved are used as a guide in setting up a calculation. The method is based on the use
of conversion factors and on the idea that units or dimensions of various quantities can be handled algebraically
in the same way as numbers are handled.
Conversion factors are constructed from equalities such as the following:
2.540 cm = 1 in
1000 g = 1 kg
24 h = 1 day
From the first one, we can also write "2.54 cm per inch." Likewise, there are 1000 grams per kilogram,
and 24 h per day. Since the "per" can mean "divided by," we can write the following conversion factors:
2.54 cm
,
1 in 1 000 g
24 h
, and
1 kg
1 day These conversion factors are examples of unit factors. Each unit factor is equal to 1 (unity) bec...
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This note was uploaded on 09/15/2009 for the course CHEM 102 taught by Professor Bastos during the Spring '08 term at Adelphi.
 Spring '08
 BASTOS
 pH

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