Measurement
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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


  • 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


256.15 g


5.55 cm


124.465 g


52.6 ml


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


  • Bar Graphs

    • used when you want to compare different data such as objects or events


  • Pie Graphs

    • show the amount each part makes of up of the whole (100%).


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