Presentation on theme: "SI UNITS & METRIC CONVERSIONS"— Presentation transcript:
1 SI UNITS & METRIC CONVERSIONS UNIT II.2 & II.3 PPTSI UNITS & METRIC CONVERSIONS
2 II.2 SI UNITS SI = International system of metric units. Base unit = basic unit of measurement(all other units are multiples of base units or combinations)1. BASE UNITSlength = metre (m)mass = gram (g)time = seconds (s)amount of substance = mole (mol)
3 II.2 SI UNITS 2. MULTIPLES OF BASE UNITS kilo = k (103) centi = c (10-2)milli = m (10-3)**Table on page 17 – KNOW**3. IMPORTANT EQUIVALENCES1 mL = 1 cm31 m3 = 103 L1 t = 103 kg
4 II.2 SI UNITS Example: Re-write the expression “6 kilograms” using PREFIX and UNIT SYMBOLSan EXPONENTIAL EQUIVALENTThe prefix symbol that stands for kilo is ___ and the unit symbol that stands for grams is ___6 kilograms =The exponential equivalent to kilo is ____Questions: p.19 #11-14
5 II.3 METRIC CONVERSIONSMetric conversions involve using unit conversions between prefix symbols and exponential equivalents.Example:Write a conversion statement between cs and s.‘c’ stands for _____thenQuestions: p.19 #15 (odds)
6 II.3 METRIC CONVERSIONS Example: How many millimeters are in 5 km? Unknown amount =Initial amount =Conversion factors = Combine conversion factors to make connection:Solution
7 II.3 METRIC CONVERSIONSDiagram (p. 20) – how prefix symbols relate to a central base unit:
8 II.3 METRIC CONVERSIONS Example 1: Express 7µm in Megametres. Example 2: (p.21 #16e)If 1 dL = 10-1 L and 1 kL = 103 L, how many decilitres in 0.5kL?
9 II.3 METRIC CONVERSIONS DERIVED QUANTITIES Derived quantity = Questions: p. 21 #16,17,18,24,28DERIVED QUANTITIES Derived quantity =Derived unit =Example on p. 23Question: p. 21 #29
10 II.3 METRIC CONVERSIONS Example 3: Convert 1cg/ mL into dg/L Unknown: Initial:Conversion factors =Solution:
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