Measurements and Calculations
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What is measurement?
- Its the quantitative observation/comparison
- Contains two parts: A number and unit
A technique used to express very large or very small numbers based on powers of 10
Ex. 1.23 X 102
The number before it is placed in scientific notation
- Symbol: K
- Value: 1,000
- SN: 103
- Symbol: c
- Value: 0.01
- SN: 10-2
- Symbol: m
- Value: 0.001
- SN: 10-3
Length is measured in...
SI unit: Meter (m)
1 inch =
2.54cm (exact number)
Solid volume is measured in...
SI unit: m3
Gas or liquid volume is measure in...
SI unit: mL
What is volume?
The amount of 3-dimensional space in m3
What is mass?
- Amount of matter present
- SI unit: kg
Uncertainty in Measurement
- A measurement always has some amount of uncertainty
- Comes from limitations of techniques & equipment
Can be used to indicate the uncertainty of a measurement.
(0.57 ± 0.01)
Rules for counting SF's
- All nonzero integers are always significant
- Leading zeros never count as SFs
- Captive zeros are always significant
- Trailing zeros are significant if there is decimal pt
Unlimited number of SFs come from..
- ex. 2.54 cm/in
- 1000 mL in a L
- 121 students in a room
An exact numbers are
- Known with certainty
- Defined numbers: 1 minute = 60 seconds ect
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