The general form of a unit conversion calculation,
UNKNOWN AMOUNT = INITIAL AMOUNT X CONVERSION FACTOR
Memorize the SI Prefixes and Conversion Factors Table!!!
10^12 | 10^9 | 10^6 | 10^3 | 10^2 | 10^1 | 10^-1 | 10^-2 | 10^-3 | 10^-6 | 10^-9 | 10^-12 |
tera | giga | mega | kilo | hecto | deka | deci | centi | milli | micro | nano | pico |
T | G | M | k | h | da | d | c | m | µ | n | p |
Base Units In The International System (SI)
QUANTITY | WRITTEN UNIT | UNIT SYMBOL |
Length | Metre | M |
Mass | Gram | g |
Time | Second | S |
Amount of substance | Mole | mol |
Some Important Equivalences
1mL = 1 cm^3
1cm^3 = 10^3 L
1t = 10^3 kg
Exercises
1) How many micrometres are there in 5 cm?
(µm) – (m) – (cm)
# of µm – 5cm x 10^-2 m / 1cm x 1 µm / 10^-6 m = 5x 10^4 µm
2) Express 8 kg in milligrams.
1kg = 10^3g
1mg = 10^-3g
(kg) –(g) – (mg)
# of mg = 8kg x 10^3 g/ 1kg x 1mg/10^-3g = 8x 10^6 mg
now, a little science cartoon :)
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