kilo-: 1,000 times (k)
hecto-: 100 times (h)
deka-: 10 times (da)
deci-: one tenth (d)
centi-: one hundredth (c)
milli-: one thousandth (m)
micro-: one millionth (the Greek letter mu)
nano-: one billionth (n)
pico-: one trillionth (p)
femto-: 10 to the negative 15 (f)
mega-: 1,000,000 times (M)
giga-: 1,000,000,000 times (G)
tera-: one trillion times (T)
peta-: 10 to the 15th (P)
exa-: 10 to the 18th (E)
yotta-: 10 to the 24th (Y)
yocto-: 10 to the negative 24th (y)
How many millimeters in a centimeter?: 10
How many centimeters in a meter?: 100
How many meters in a kilometer?: 1,000
How many millimeters in a meter?: 1,000
How many grams in a kilogram?: 1,000
How many milligrams in a gram?: 1,000
How many milliliters in a liter?: 1,000
How many liters in a kiloliter?: 1,000
How many kilobytes in a megabyte (decimal)?: 1,000
Base unit of length: Meter
Base unit of mass: Kilogram
Base unit of time: Second
Base unit of volume commonly used: Liter
Base unit of temperature in SI: Kelvin
Base unit of electric current: Ampere
Base unit of amount of substance: Mole
Base unit of luminous intensity: Candela
How many base SI units are there?: Seven
About how long is a meter?: A little over 3 feet (39.4 inches)
About how long is a centimeter?: About the width of a fingernail
About how far is a kilometer?: About 0.6 miles
About how heavy is a kilogram?: About 2.2 pounds
About how heavy is a gram?: About a paper clip
About how much is a liter?: A bit more than a quart
About how much is a milliliter?: About 20 drops of water
What does 1 mL of water weigh?: 1 gram
Volume of 1 cubic centimeter: 1 milliliter
Volume of 1 cubic decimeter: 1 liter
25 mm equals how many cm?: 2.5 cm
3 km equals how many m?: 3,000 m
2 kg equals how many g?: 2,000 g
500 mL equals how many L?: 0.5 L
1.5 m equals how many cm?: 150 cm
Celsius to Fahrenheit: F = C x 9/5 + 32
Fahrenheit to Celsius: C = (F - 32) x 5/9
Freezing point of water: 0 C = 32 F = 273.15 K
Boiling point of water: 100 C = 212 F = 373.15 K
Normal body temperature: About 37 C (98.6 F)
Room temperature: About 20-25 C (68-77 F)
Convert Celsius to Kelvin: Add 273.15
Scientific notation for 3,000: 3 x 10^3
Scientific notation for 0.002: 2 x 10^-3
Meter was once defined as: One ten-millionth of the distance from the equator to the North Pole (1790s idea)
Which countries use the metric system officially?: Almost every country; the US mainly uses customary units in daily life
What does SI stand for?: International System of Units
Mass vs weight units: Mass in kilograms; weight (a force) in newtons
Density of water: 1 gram per cubic centimeter
Hectare: 10,000 square meters
Metric ton (tonne): 1,000 kilograms
Angstrom: One ten-billionth of a meter, used for atoms
Micron (micrometer): One millionth of a meter
Nanometer: One billionth of a meter; used for wavelengths of light

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