1. Summary of Standard Measurements
Physical Science
Summary of Standard Measurements

2. Standard Measurements
Scientific experiments
Exact quantity that people agree for comparison
Measurements are made using same standard
Compared to each other SI
Base unit (length, time, mass, temperature, and volume, density)
Powers of 10

3. SI units
Length (m)
Conversions can be done by multiplying or dividing units by powers of 10 (10, 100, 1000)
Number and unit label
Larger to smaller (multiply or move decimal right)
Smaller to larger (divide or move decimal left)
Prefixes remain the same not matter what base unit
Mili-, centi-
K h da base unit d c m _ _ _
(L, m, g)
532cm to meters?

5. SI units K h da base unit d c m _ _ _ 532cm to meters? 53200m
(L, m, g)
532cm to meters? m

6. ACCURACY VS PRECISION Accuracy Precision
Relates to closeness of a measured value to a standard or known value
How correct a measurement is
Precision
How repeatable a measurement is
You can be precise but not accurate
Significant digits in calculations

7. Volume Space occupied by an object cm3 (know 1cm3 = 1mL)
Length X Width X Height

8. Mass and Density Mass Density Matter of an object
kg or g
Density
Derived unit since you find density by combining units from mass and volume
Mass divided by volume (g/cm3)

9. Time and Temperature Time (s) Temperature Celsius (C ) scale
00 water freezes
1000 water boils
SI unit Kelvin (K) add 273 to Celsius value

10. Graphing Visual display of information
Correct graph for data displayed
Line graphs
Show trends or data (change over time)
Independent variable (x – axis) time
Dependent variable (y – axis) temperature
Bar graph
Comparing information collected by counting
Circle graph
Show how fixed quantity is broken down into parts, %