# Ch.3 Outline - Chapter 3 Outline 1 Measurements are...

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1. Measurements are quantative observations: Qualitative- no numerical / Quantitative – numerical –also called measurements Measurements are not numbers- 1: numbers always involve a comparison. WRITING DOWN A MEASUREMENT WITHOUT A UNIT IS A COMMON AND SERIOUS MISTAKE. 2: measurements always involve uncertainty- inexact. ANY DECISION OR CONCLUSION BASED ON MEASUREMENTS MUST CONSIDER THE ERROR IN THE MEASUREMENTS. 2. Measurements always include units SI units are standard- metric- multiples of 10 International System of Units- *SI* All SI units are built from seven base units- length, mass, time, and temperature, amount of substance, the mole, ampere Length – meter (m) Mass – kilogram (kg) Time – second (s) Electrical current – ampere (A) Temperature – Kelvin (K) Amount of substance – mole (mol) Luminous intensity – candela (cd) UNITS UNDERGO THE SAME KINDS OF MATHEMATICAL OPERATIONS THAT NUMBERS DO. Construct SI units of any convenient size using decimal multipliers- prefixes ( mega, kilo, deci, centi, milli, micro, nano, pico Non-SI units are still in common use- English system of units – inches, fee, miles, ounces, quarts, gallons, ounces, pounds. 1cm – 10

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## This note was uploaded on 07/05/2008 for the course CHEM 1311 taught by Professor Sibert during the Fall '08 term at University of Texas at Dallas, Richardson.

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Ch.3 Outline - Chapter 3 Outline 1 Measurements are...

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