Conversion Factors
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What is a conversion factor?
 obtained from an equality (ex. 1 in. = 2.54 cm)
 written as a fraction (ratio with a numerator and denominator & inverted to give two conversion factors for every equality.
 1 in and 2.54 cm
  
 2.54 cm 1 in

Write conversion factors from the equality for litters and mL
 1 L and 1000 mL
 
 1000ml and 1 L

Write conversion factors from the equality for hours and minutes
 1 h and 60 m
 
 60 m and 1 h

Write conversion factors from the equality for meters and kilometers
 1 km and 1000 m
 
 1000 m and 1 km

How do you solve a problem?
identify the given unit and the needed unit.

What is the given and needed unit for a person that has a height of 2.0 meters?
 given: meters
 needed: inches

An injured person loses 0.30 pints of blood. How many milliliters of blood would that be? Identify the given and needed units given in this problem.
 Given: pints
 Needed: milliliters

How do you do a problem set up for conversion factors?
 Unit 1 ......x unit 2 =................... unit 2
 .................
 ...................unit 1
 given unit ...conversion factor ......needed unit

How many minutes are in 2.5 hours?
Given unit:
Needed unit:
Plan:
Set Up Ptoblem:
 Given unit: hours
 Needed unit: minutes
 Plan: hours > minutes
 Set Up Ptoblem:
 2.5h x 60 m
 ..........
 .......... 1 h
answer: 150min (2 SF..significant factors)