Significant Figures
Significant Figures
Significant Figures
There are 2 different types of numbers
1. Exact numbers 2. Measured numbers - they are measured with a
measuring device so these #s have ERROR.
When you use your calculator your ans. can only be as accurate as your worst measurement
2
Exact Numbers
An exact # is obtained when you count objects or use a defined relationship.
Counting objects are always exact 2 soccer balls 4 pizzas
Exact relationships, conversions, are not measured 1 foot = 12 inches 1 meter = 100 cm 1 mole = 6.02 x 1023 particles
For instance, is 1 foot = 12.000000000001 inches? No 1 ft is EXACTLY 12 inches.
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Pencils down. Learning Check #1
More than one answer may be correct!
A. Exact numbers are obtained by 1. using a measuring tool 2. counting 3. definition
B. Measured numbers are obtained by 1. using a measuring tool 2. counting 3. definition
4
Pencils down.
Solution
A. Exact numbers are obtained by 2. counting 3. definition
B. Measured numbers are obtained by 1. using a measuring tool
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