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Measurement. Common Metric Prefixes. International System of Measurement ( SI ). SI units form a base-10 or decimal system. kilo….hecto….deka….BASE….deci….centi….milli. 1000 100 10 1 0.1 0.01 0.001. meter gram liter. example: 6,532,492cm => ?km.

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international system of measurement si
International System of Measurement (SI)
  • SI units form a base-10 or decimal system.

kilo….hecto….deka….BASE….deci….centi….milli

1000 100 10 1 0.1 0.01 0.001

meter

gram

liter

example: 6,532,492cm => ?km

65.32492km

example: 0.00032kg => ?g

0.32g

measurement1
Measurement

Common units of measurements and equipment to use--

  • Mass: g, kg
    • Use balance or scale
  • Distance: mm, cm, m, km
    • Use ruler or meter stick
  • Volume: ml, L, cm3
    • Use graduated cylinder
  • Temperature: ºC, ºF, Kelvin
    • Use thermometer
  • Time: seconds, minutes, hours…..
    • Use stop watch

= most common

precision accuracy and resolution
Precision, Accuracy, and Resolution
  • Precision
    • describes how close together repeated measurements or events are to one another-- even if it is wrong
  • Accuracy
    • how close the measurement is to the correct answer
  • Resolution
    • the smallest amount that can be measured
significant digits figures
Significant digits (figures)
  • are the meaning full digits in a measurement
    • meaningful the numbers the equipment can measure AND one more that you estimate
slide12
best answer is around 2.63 cm
  • to a scientist this number means “between 2.60 and 2.70 cm.”
  • the last digit, 3, representing the smallest amount, is uncertain, but it is still significant
  • always “push it” one more decimal place by estimating
graphing
Graphing

“MIXES TUL”

  • M: maximize your graph (use all of the graph paper)
  • IX: Independent variable on X-axis (dependent variable on y-axis)
  • ES: Equally Spaced scale increments (start at 0)
  • T: Title (descriptive and mentions the y-variable vs. x-variable)
  • UL: Units and Labels on both axes
types of graphs
Types of Graphs
  • Line or scatterplot graphs
    • can help determine if two variables are related
    • can connect the dots or sometimes draw a line of best fit
slide19
Bar Graphs
    • used when you want to compare different data such as objects or events
slide20
Pie Graphs
    • show the amount each part makes of up of the whole (100%).
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