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Copy of CHEM Dimensional Analysis

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by

Skyler Garrahy

on 3 October 2013

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Transcript of Copy of CHEM Dimensional Analysis

Dimensional Analysis
Dimensional Analysis
The systematic conversion of units.

AKA The tool we use to get from one set of units to another.
Conversion Factor
To do dimensional analysis, you need 1 or more conversion factors.

A conversion factor is an equality (ex: 1 lb = 16 oz) expressed as a fraction.
Conversion Factors
When you multiply by a conversion factor, you are essentially multiplying by 1!

Use as a BRIDGE to get from the units you HAVE to the units you WANT.
Step 5
What if....?
We needed to convert from mph to km/hr?

We needed to convert from Fahrenheit to Celsius?

Dollars to Euros?
Systems of Measurement
1. Standard
2. Metric
3. System International
What can we Measure?
Mass - grams
Length - meters
Volume - liters
Temperature - degrees
Ask yourself:
1. What units do I have?

2. What units do I want?

3. What conversion factors should I use to get from what I have to what I want?

4. Do my units cancel?
Practice!
I have 15.9 lbs. How many ounces do I have?
(1 lb = 16 oz)
Practice!
The length of a piece of wood is 13.25 km. Express this in cm.

1 m = 100 cm
1 km = 1000 m
Practice!
How many seconds are in a day?
Practice!
When a ball is going 100 miles per hour, how many feet will it go in 2 seconds?

1 mile - 5,280 feet
3,600 seconds = 1 hour
Full transcript