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UNIT II.2 & II.3 PPT

UNIT II.2 & II.3 PPT. SI UNITS & METRIC CONVERSIONS. 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 UNITS length = metre (m) mass = gram (g)

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UNIT II.2 & II.3 PPT

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  1. UNIT II.2 & II.3 PPT SI 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 UNITS • length = 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 EQUIVALENCES • 1 mL = 1 cm3 • 1 m3 = 103 L • 1 t = 103 kg

  4. II.2 SI UNITS Example: • Re-write the expression “6 kilograms” using • PREFIX and UNIT SYMBOLS • an EXPONENTIAL EQUIVALENT • The prefix symbol that stands for kilo is ___ and the unit symbol that stands for grams is ___ • 6 kilograms = • The exponential equivalent to kilo is ____ • 6 kilograms = • Questions: p.19 #11-14

  5. II.3 METRIC CONVERSIONS • Metric conversions involve using unit conversions between prefix symbols and exponential equivalents. Example: • Write a conversion statement between cs and s. • ‘c’ stands for _____ • then Questions: 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 CONVERSIONS • Diagram (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 • Questions: p. 21 #16,17,18,24,28 DERIVED QUANTITIES • Derived quantity = • Derived unit = • Example on p. 23 • Question: p. 21 #29

  10. II.3 METRIC CONVERSIONS Example 3: • Convert 1cg/ mL into dg/L • Unknown: • Initial: • Conversion factors = • Solution:

  11. ASSIGNMENT

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