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S isystem
The document discusses the SI system of measurement. It defines a measurement as having two parts - a number and a unit. The SI system establishes standard units for seven base quantities: meter (length), kilogram (mass), second (time), ampere (electric current), kelvin (temperature), mole (amount of substance), and candela (luminous intensity). SI prefixes are used to denote multiples and submultiples of units, such as kilo, centi, and milli. Conversions within the metric system involve moving the decimal place in the number to change the unit, as shown through examples converting between liters and milliliters, grams and milligrams, and kilograms and milligrams.
S isystem
- 1. The SI Systemof Measurement
- 2. The Nature ofMeasurement A Measurement is a quantitative observation consisting of TWO parts Part 1 - number Part 2 - scale (unit) Examples: 20 grams 6.63 x 10-34 Joule·seconds
- 3. The Fundamental SIUnits (le Système International, SI) Physical Quantity Name Abbreviation Mass kilogram kg Length meter m Time second s Temperature Kelvin K Electric Current Ampere A Amount of Substance mole mol Luminous Intensity candela cd
- 4. SI Prefixes Commonto Chemistry Prefix Unit Abbr. Exponent Kilo k 103 Deci d 10-1 Centi c 10-2 Milli m 10-3 Micro 10-6
- 5. Metric Conversions g m 103 102 101 L 10-1 10-2 10-3 kilo hecto deka deci centi milli Base unit Conversions in the metric system are merely a matter of moving a decimal point. The “base unit” means the you have a quantity (grams, meters, Liters, etc without a prefix.
- 6. Metric Conversions g m 103 102 101 L 10-1 10-2 10-3 kilo hecto deka deci centi milli Base unit 18 L 1 2 3 18 liters = 18 000 milliliters Example #1: Convert 18 liters to milliliters
- 7. Metric Conversions g m 103 102 101 L 10-1 10-2 10-3 kilo hecto deka deci centi milli Base unit 3 2 1 450 mg = 0.450 g 450 mg Example #2: Convert 450 milligrams to grams
- 8. Metric Conversions g m 103 102 101 L 10-1 10-2 10-3 kilo hecto deka deci centi milli Base unit 20 kg 1 2 3 4 5 6 20 kg = 20 000 000 mg Example #3: Convert 20 kilograms to milligrams