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Equivalence
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An equivalent is a statement of fact relating one unit to another.
Examples:
Equivalents
  • 12 inches equals 1 foot (or 12 inches = 1 foot)
  • 5,280 feet equals 1 mile (or 5,280 feet = 1 mile)
  • 60 seconds equals 1 minute (or 60 seconds = 1 minute)
An equivalent can be written as 2 rates called conversion factors.
Example Equivalents and their Two Conversion Factors
Equivalent
(Statement of fact)
--> Conversion
Factor 1
OR Conversion
Factor 2
12 inches = 1 foot --> 12 inches / foot OR 1 foot per 12 inches
1foot / 12 inches
5280 feet = 1 mile --> 5280 feet per 1 mile
5280 feet / 1 mile
OR 1 mile per 5280 feet
1 mile / 5280 feet
60 sec. = 1 min. --> 60 sec. per 1 min.
60 sec. / 1 min.
OR 1 min. per 60 sec.
1 min./60 sec.

Note:
In the English System, there's no pattern to the numbers in the equivalents. (Look in above table at the numbers: 12, 5280, 60.) That's why scientists don't use the English System. They use the metric system, which we'll get to. I'm using the English System for now because we're more familiar with it.
People who saw this lesson also found the following lessons useful:
Types of Unit Systems
Units-Types of Units
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Working with units
Conversion from one unit to another
 
   
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