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# CH 2-1 - CH 2 Scientific Measurement Renee Y Becker CHM...

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CH 2: Scientific Measurement Renee Y. Becker CHM 1025 Valencia Community College 1

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Measurements Measurement A number with an attached unit Examples: 15 inches 3 cups 36 cm Every measurement must include units!! 2
Example 1: Measurements In the following, what are the measurements and what are the units? a) 12 trees b) 2.3 mm c) 100 ¢ 3

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Measurements Instrument A device for recording a measurement Examples: Ruler (length), electronic balance (mass), Graduated cylinder (volume) 4
Uncertainty An instrument may give a very sensitive reading, but EVERY measurement has UNCERTAINTY No measurement instrument is perfect and neither is the person using it 5

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Example 2: Length Measurements If we need to measure the length of this candycane, which ruler should we use? Why? 6
Mass Mass Measure of the amount of matter it possesses Measured by a balance Not affected by gravity Typical units: kilogram (kg), gram (g), pound (lb), ounce (oz) Weight Force exerted by gravity on an object 7

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Balances 8
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CH 2-1 - CH 2 Scientific Measurement Renee Y Becker CHM...

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