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Lec2 - Lec2: RoyA.Lacey,;Che 131,Fall2010 1...

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1 Roy A. Lacey, Stony Brook University; Che 131, Fall 2010 Lec 2: Measurements and units
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2 Roy A. Lacey, Stony Brook University; Che 131, Fall 2010 Scientific Method A hypothesis is a tentative and testable explanation for an observation or a series of observations. A scientific theory is a general explanation of widely observed phenomena that have been extensively tested. Why are measurements important?
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3 Roy A. Lacey, Stony Brook University; Che 131, Fall 2010 ` Accurate measurements are essential for characterizing the physical and chemical properties of matter. ` Standardization of the units of measurements is essential. Measurements UNITS MATTER!! ` Quantitative easy to check ` Easy to agree upon, no personal bias ` The measuring instrument limits how good the measurement is.
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4 Roy A. Lacey, Stony Brook University; Che 131, Fall 2010 SI Units Quantity Base Unit Abbrev. Length Mass Time Temp meter kilogram second Kelvin m kg s K Amount mole mol Symbol l m t T n
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