Dimensional Analysis
Conversion of a given result from one system of units to another
In science, we often use unit factors to convert to different units
Some examples:
16 oz./1 lb. another orientation is 1 lb./16 oz.
1 in./2.54 cm an alternative orientation is 2.54 cm/1 in.
These factors do not change the number (measurement) only the unit
Things to remember when converting units:
1) Use unit factors that relate the given unit to the desired unit
2) Derive the orientation of the unit factor by looking at the given unit
and the desired unit
3) Perform the mathematical operation necessary (make sure appropriate
units cancel)
4) Check the sig. figs. and the units
5) Does the answer make sense?
How many miles would you walk if you had to walk 10.0 km?
You need to know:
1 km = 1000 m
1 m = 100 cm
1 in = 2.54 cm
5280 ft = 1 mile
12 in = 1 ft
