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
• NOT all same instruments calibrated the same

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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
67.4 ml
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13.0 ml
12.9 ml 13.1 ml ? ?
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6.68 ml
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Can you figure the calibration of any piece of
lab equipment?
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meter stick two closest lines are 1 mm
(millimeter) apart
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? calibration
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quadruple beam balance
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183.599 g
183.601 g
183.600 g
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buret ? calibration
0.1 ml
21.35 ml
note unlike graduated cylinder, numbers go down,
so you read backwards from way read graduated
cylinder
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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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comparing 3 different scales
comparing 3 different temperature scales
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Worlds Record Cold Temperatures

• Date
  F C
• World
• East Antarctica
  8/2010 135.8 94.7
• Verkhoyansk, Russia (Siberia) 2/7/1892
  94 70
• Asia
• Oimekon, Russia 2/6/1933
  90 68
• Greenland
• Northice 1/9/1954
  103 75
• No. America
• Snag, Yukon, Canada 2/3/1947
  81 63
• US
• Prospect Creek, Alaska 1/23/1971
  80 62
• Rogers Pass, Montana 1/20/1954
  70 56.5

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Conversion formulas

• To convert between celsius Kelvin scales
• K C 273 (more precisely 273.15)
• C K 273
• F (9/5 C) 32

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• errors in science experiments 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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Calculation of Error

• ?measured value accepted value? x 100

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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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calc differences in density
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then calculate error
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What can do with error?

• easy to compare data from one student/group to
  another
• easy to compare data from one trial to another
• can map change from one lab to next or from start
  of year to end