INTRODUCTION TO MEASUREMENT THE METRIC SYSTEM SCIENTIFIC NOTATION

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INTRODUCTION TO MEASUREMENT, THE METRIC SYSTEM, SCIENTIFIC NOTATION, and DIMENSIONAL ANALYSIS

INTRODUCTION TO MEASUREMENT, THE METRIC SYSTEM, SCIENTIFIC NOTATION, and DIMENSIONAL ANALYSIS

UNITS OF MEASURE ARE IMPORTANT

UNITS OF MEASURE ARE IMPORTANT

UNITS OF MEASUREMENT

UNITS OF MEASUREMENT

Example

Example

METRIC SYSTEM • Metric system (Le Systeme International d’ Unites) AKA “S. I. ”–

METRIC SYSTEM • Metric system (Le Systeme International d’ Unites) AKA “S. I. ”– common units of measurement for everyone (else) • Based on multiples or divisions of base unit 10 (remember the Dewey decimal system? ) • Common metric units of measure for: Length Mass Volume Time Energy meter gram Liter second Joule

METRIC PREFIXES http: //micro. magnet. fsu. edu/primer/java/science opticsu/powersof 10/

METRIC PREFIXES http: //micro. magnet. fsu. edu/primer/java/science opticsu/powersof 10/

Metric Prefixes Meter Liter gram cro mi lli mi ci de nt Base unit

Metric Prefixes Meter Liter gram cro mi lli mi ci de nt Base unit 10 -1 10 -2 10 -3 10 -4 10 -5 10 -6 i 100 ce ka De lo 105 104 103 102 101 Ki M eg a 106

Measurement • All measurements have some degree of error associated with them – we

Measurement • All measurements have some degree of error associated with them – we like to have high accuracy and high precision • Accuracy: Being able • Low accuracy / High precision • High accuracy / Low precision • Precision: Being able • Low accuracy / Low to come up with the precision same value repeatedly • High accuracy / High precision to come up with the “correct” or “accepted” value

Reading measurements • Always report measurements to one more decimal place than you are

Reading measurements • Always report measurements to one more decimal place than you are able to measure with the given scale I. e. you estimate the last digit • Always include the unit used to make the measurement – otherwise, your number is meaningless!! (ml, g, cm etc. ) ruler Graduated cylinder

Measurement • Accuracy: Being able to come up with the “correct” or “accepted” value

Measurement • Accuracy: Being able to come up with the “correct” or “accepted” value Precision: Being able to come up with the same value repeatedly Low accuracy / High precision High accuracy / Low precision Low accuracy / Low precision High accuracy / High precision

METRICS AND MEASUREMENT Described in terms of ACCURACY and PRECISION

METRICS AND MEASUREMENT Described in terms of ACCURACY and PRECISION

METRICS AND MEASUREMENT 1. Measurements can be: • QUANTITATIVE: numerically represented and measured •

METRICS AND MEASUREMENT 1. Measurements can be: • QUANTITATIVE: numerically represented and measured • Ex. : length of hair = 4. 7 cm, volume of soda = 356 m. L • QUALITATIVE: descriptive • Ex. : color of hair = brown, taste of soda = sweet