The Measurement System of Science

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Presentation transcript:

The Measurement System of Science SI Units (the Metric system) The Measurement System of Science Do these mean anything to you? Kilo: kilometer, kilogram Centi: centimeter, cents, century Deca Decathlon, decade

Base Units The International System (SI -- Le Système International d’Unités) has seven base units: Length (meter - m) Mass (kilogram - kg) Time (second - s) Amount of a substance (mole - mol) Temperature (kelvin - K) Electric Current (ampere - A) Luminous Intensity (candela - cd) ADD Volume (liter – L) – not really an SI unit!

Prefixes -- gives it meaning! There are eight prefixes that you will need to know for the SI units: Abbrev. Mega (1,000,000 x base; M 1 mega-base = 1000000 base) kilo (1000 x base; 1 kilo-base = 1000 base) k hecta (100 x base; 1 hecta-base = 100 base) h deca (10 x base; 1 deca-base = 10 base) da deci (base/10; 10 deci-base = 1 base) d centi (base/100; 100 centi-base = 1 base) c milli (base/1000; 1000 milli-base = 1 base) m micro (base/1000000; /u 1000000 micro-base = 1 base)

So what? How do we use them? Any SI unit has two parts: prefix base For example, kilo-gram kilo-meter centi-meter centi-gram So, what do we call 10 grams? deca-gram What do we call .001 seconds? milli-second How about .1 liters? deci-liter