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MEASUREMENT : IT'S ALL ABOUT NUMBERS
Transcript of MEASUREMENT : IT'S ALL ABOUT NUMBERS
Don't Get Lost !!!
What is Measurement
Measurement is a Data Gathering Process
in which a numerical value of a given
Dimension is determined by comparing it to a set of Standard Units.
Characteristics of Good Standard
1. The Standard should be Fixed or Unchanging, rigid and not strechy.
2. Universal or known to everybody (who uses that standard).
3. With-in the Range of what is being measured. Not too big and not too small.
4. Easily Unifies or combines with other Standard units to make up derived or combined Units
Be Precise and Accurate by using
the Correct instrument CORRECTLY !!!!
SI or Metric Units
Two types of Units:
1. Base Units - Quantities that you can actually measure yourself.
Meter, Centimeter, Liter, Gram, Kilogram, Degree Centigrade or Kelvin
2. Derived Units - Quantities made up of Base Units (Calculated).
Density (g/cc), Force (Kg-M/s2), Velocity (M/s), Joule (N.M), Pascal (Kg/m.s2
Measures of exactness
1. Accuracy - is a measure of Correctness ( How close the value is to the Actual Value)
2. Precision - is a measure of Consistency
( Do you get the Same Reading each Time)
3. Error - is a measure of Variation
( How far away in the Measured Value from the Actual or True Value)
Note: You can be VERY Precise but also Very Inaccurate (Wrong).
A System of Maintaining the reliability of
numeric results of Combined, Calculated or derived Values or Measures according to the
Scale used to get those values.
If you use small (precision) instruments for some measurements and large (crude) instruments for other measurements, then your combine result are scientifically meaningless. You must be consistent and
choose to correct scale for what you are measuring based on what you are using the measurements for.
It's a Desert
Common or English System
Inches, Foot, Yard, Mile, Pound, Gallon, Etc.
Metric or SI Units:
(used in Science)
Meter, Liter, Gram, Centigrade or Kelvin
Two Standards of Measure