Calibration, Temperature

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Calibration, Temperature Percent Error
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What is Calibration?

• Calibration of any measuring device is distance
  between two closest lines
• (Not distance between two closest s!)

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Not all graduated cylinders calibrated same way
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• Large graduated cylinder
• ? capacity
• ? calibration

1000 ml
10 ml
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? calibration
1 ml
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Here are some other pieces of lab equipment.
Can you figure the calibration of each?
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meter stick two closest lines are 1
millimeter apart
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? calibration
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This is a quadruple beam balance
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This is a buret ? calibration
0.1 ml
Note unlike graduated cylinder, numbers go down,
so you read downwards
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• Temperature
• Scales

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• Scientifically speaking

The definition of temperature Temperature is
measure of average kinetic energy of particles in
system
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Worlds Record Cold Temperatures

• Date
  F C
• World (Antarctica) Vostok II 7/21/1983
  129 89
• Verkhoyansk, Russia (Siberia) 2/7/1892
  94 70
• Asia Oimekon, Russia 2/6/1933
  90 68
• Greenland Northice 1/9/1954
  87 66
• No A Snag, Yukon, Canada 2/3/1947
  81 63
• US Prospect Creek, Alaska 1/23/1971
  80 62
• US (other than AK)
• Rogers Pass, Mont.
  1/20/1954 70 56.5

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Conversion formulas

• How can we convert from one temperature scale to
  another?
• K C 273 (more precisely 273.15)
• C K 273
• F (9/5 C) 32

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• Errors are inevitable and need to be dealt with

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Percent Error

• Ratio of error to accepted value
• error Error x 100
• accepted value

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Error

• ?measured value accepted value? x100

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Data table
Students asked to find density of sucrose
Sucrose has density of 1.59 g/cm3
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Lets calculate the error
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Now lets calculate error
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Advantage of Error

• easier to compare data, especially if comparing
  data from different trials