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UNIT 1 Foundations

UNIT 1 Foundations. Chapter 3 - Measurements. Chapter 3A – Scientific Measurements. Objectives: Describe how scientists make measurements Compare and contrast quantitative and qualitative data Recall the decimal equivalents for metric prefixes

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UNIT 1 Foundations

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  1. UNIT 1Foundations Chapter 3 - Measurements

  2. Chapter 3A – Scientific Measurements • Objectives: • Describe how scientists make measurements • Compare and contrast quantitative and qualitative data • Recall the decimal equivalents for metric prefixes • Convert data reported in one unit to another unit • Assignment: Section Review, page 64

  3. Basic Terms of Measurement • What is a measurement? • A comparison of adimensionof an object or substance to an appropriate standard, usually an instrument with a calibrated scale. • Dimension • A property that can be measured • Standard • A known quantity that everyone agrees will be used for comparison when measuring. • Instrument • Any artificial device made for the purpose of refining, extending, or substituting for the human senses when measuring. • Calibrated scale • A series of markings related to the dimensional unit on an instrument

  4. Measured Data • What is better, qualitative or quantitative data? • Quantitative because it is less likely to be misinterpreted due to observational bias. • Flawed perspective on data that results from a person’s desire to see a certain outcome or from one’s limitations. • Measure data has two parts: a number and a UNIT • A unit is important because it identifies that the number is a measurement and it tells what kind and size of the dimensions

  5. The Metric System • We had a common language of science, Latin, but the standard of units was not the same. • Scientists had great difficulty communicating with each other. • In 1799 France came up with the decimal metric system • Scientists adopted it because it was based on a standard and was easy to use • Everything was related by a power of 10 • In 1960 the world agreed on a global metric system, SI – System of International Units • The metric system started with two base units and now there are seven

  6. Metric Conversions • Are 2m, 200cm, and 2000mm all the same? • YES, using conversion factors • Any factor equal to one that consists of a ratio of two numbers • What are some conversion factors that you already know? • Sample questions • How many mL are there in 2L? • Which contains more mass, 350g or 3.5kg? • How did they measure in Bible times? • Facet on page 63

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