Download Measurement SI Prefixes are very important when working with

Measurement
SI Prefixes are very important when working with measurements in science.
You must know what the prefixes mean in order to convert units with different measurement symbols
into a common measurement.
Example: to calculate the density if the mass is 21.00 grams and its volume is 7.0 cm3
Density = mass/volume, Density = 21.00 g/7.0 cm3 = 3 g/cm3
Example: to calculate kilometers to meters you would need to use the appropriate conversion factor.
If 1000m = 1km then 1000m/1km would be your conversion factor.
Problem: by turning 5 kilometers into meters the number should get bigger
5km x 1000m/1km = 5000m (the number went from 5 to 5000)
Example: to calculate meters to kilometers
If 1km = 1000m then 1km/1000m would be your conversion factor.
Problem: by turning 2586 meters into kilometers the number should get smaller
2586m x 1km/1000m = 2.586km (the number went from 2586 to 2.586)
The same process is used when converting other units with different metric prefixes.
Centimeter (cm) to Millimeters (mm) or milliseconds (ms) to seconds (s) or kilometers to meters
You only need to know what the prefixes mean and the process is the same as the examples above.
An important thing to remember is that in the metric prefix system the numbers stay the same but the
decimal point moves.
Deci- = 0.1
centi- = 0.01
milli- = 0.001
Measuring Temperature
The base unit of temperature in SI is Kelvin (K)
To convert from Fahrenheit to Kelvin:
1.) Subtract 32 from F
2.) Multiply your answer by 5
3.) Then Divide by 9
4.) Finally Add 273
Example:
80oF
80 – 32 = 48
48 x 5 = 240
240 ÷ 9 = 27
27 + 273 = 300oF