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Lecture 2 Measurements

Lecture 2 Measurements - Lec2:...

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Lec 2: Measurements and units 1 Roy A. Lacey, Stony Brook University; Che 131, Spring 2011 Scientific Method Why are measurements important? A hypothesis is a tentative and testable explanation for an b i i f observation or a series of observations. A scientific theory is a general explanation of widely observed phenomena that have been extensively tested. 2 Roy A. Lacey, Stony Brook University; Che 131, Spring 2011
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Measurements UNITS MATTER!! ` Accurate measurements are essential for characterizing the physical and chemical properties of matter. ` Standardization of the units of measurements is i l essential. ` Quantitative easy to check ` Easy to agree upon, no personal bias ` The measuring instrument limits how good the measurement is. 3 Roy A. Lacey, Stony Brook University; Che 131, Spring 2011 SI Units Quantity Base Unit Abbrev. Symbol Length meter m l Mass Time kilogram second kg s m t Temp Kelvin K T Amount mole mol n 4 Roy A. Lacey, Stony Brook University; Che 131, Spring 2011
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