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### 1.3 notes

1. 1. CH 1-3 Measurement
2. 2. Scientific notation is used for very large or very small numbers 3.0 X 10 n
3. 3. SI units of measure <ul><li>Scientist use a set of measuring units called SI or International System of Units </li></ul><ul><li>This helps scientist from different countries understand each others research </li></ul>
4. 4. Basic Units of Measure Candela- cd Luminous intensity Ampere- A Electric current Mole- m Amount of substance Second- s Time Kelvin- K Temperature Kilogram- kg Mass Meter - M Length
5. 5. Derived Units 2 3 2 2 2 2 2 m/s Acceleration (a) kg*m/s Force- Newton (N) kg*m/s Energy- Joule (J) m/s Speed (V) kg/m Density m Volume m Area
6. 6. SI Prefixes hundredth .01 c centi tenth .1 d deci thousand 1,000 k kilo million 1,000,000 M mega billion 1,000,000,000 G giga Meaning Multiple Symbol Prefix
7. 7. Limits to Measurement <ul><li>Significant figures show how accurately something has been measured. </li></ul><ul><li>The precision of a calculated answer is limited to the precise measure with the least significant figures. </li></ul>
8. 8. Accuracy <ul><li>Is the closeness of a measurement to the actual value of what is being measured </li></ul><ul><li>TEMPERATURE </li></ul><ul><li>To convert temperature to Kelvins you add 273 to C </li></ul>
9. 9. Problems <ul><li>What is the boiling point of water in Kelvins? </li></ul><ul><li>Convert 12Kg to g </li></ul><ul><li>Convert 5mL to L </li></ul><ul><li>You get to school at 7:23 and leave at 3:45 how long were you at school? </li></ul><ul><li>You have a temperature of 101 F how many Kelvins is it? </li></ul>