Metric System & Measurement

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Presentation transcript:

Metric System & Measurement General Biology 2006-2007

Introduction International System of Units, or simply SI. It’s simple to use. Factors of 10’s Fewer base units It’s standardized! Prefix shows the relationship of that unit to the base unit. Prefixes stay the same no matter what the base unit. General Biology 2006-2007

Measuring Distance or Length Base SI unit = meter Tools used to measure Distance = meter stick, metric ruler, metric measuring tape General Biology 2006-2007

Measuring Volume Base SI unit = liter Tools used to measure volume = graduated cylinders General Biology 2006-2007

Questions: Where do you take the reading on a graduated cylinder? Where must the cylinder be placed to take the reading? General Biology 2006-2007

Measuring Mass Base SI unit = gram Tools = Platform balance, triple beam balance, arm balance General Biology 2006-2007

The Metric System BASE UNITS- meter (m), gram (g), liter (l) PREFIXES: MEANING: Kilo- (k)  1000 more than base unit Hecto- (h)  100 more than base unit Deka- (dk)  10 more than base unit Deci- (d)  1/10 or 0.1 less than base unit Centi- (c)  1/100 or 0.01 less than base unit Milli- (m)  1/1000 or 0.001 less than base unit General Biology 2006-2007

Metric Steps Kilo- (k) move decimal left (/ by 10) hecta- (h) deca- (dk) BASE UNIT deci- (d) centi- (c) move decimal right milli- (m) (X 10) General Biology 2006-2007

Practice Problems 1) 0.092 km = ____________ cm 2) 44.36 dkm = ____________ hm 3) 98.6 g = ____________ mg 4) 0.00243 hl = ____________ ml 5) 0.956 dg = ____________ dkg 6) 82.401 cm = ____________ dkm 7) 29.1 km = ____________ m General Biology 2006-2007

Answers!!! 1) 9,200 cm 2) 4.436 hm 3) 98,600 mg 4) 243 ml 5) 0.00956 dkg 6) 0.082401 dkm 7) 29,100 m General Biology 2006-2007