Pflugerville ISD - August 20051 Pflugerville Independent School District Integrated Physics & Chemistry Measurement
Pflugerville ISD - August 20052 Quantitative and Qualitative Observations What do YOU think the difference is?
Pflugerville ISD - August 20053 1) What is a system of measurement ? 2) Metric system- AKA International system, and SI (Systeme International d'Unites) English system- AKA British system, customary system & “our” system 3, 4, 5, 6) METRIC!!!!!!
Pflugerville ISD - August 20054 7 Base Metric Units Meters measure length Kilograms measure mass Seconds measures time Kelvin measures temperature Ampere measures current Lumens measures light intensity Moles measures the amount of a substance
Pflugerville ISD - August 20055 Metric Prefixes Kilo = 1000 Hecto = 100 Deka = 10 Deci = 1/10 Centi = 1/100 Milli = 1/1000
Pflugerville ISD - August 20056 Other Derived Metric Units (from basic 7) Volume is length x width x height measured in centimeters cubed or millilters Temperature is measured in degrees celsius or centigrade ( o C) Heat is measured in calories (cal) or joules (J) Weight is measured in newtons (N)
Pflugerville ISD - August 20057 How Big? A meter is about 39 inches A kilometer is 0.6 mile A centimeter is about the width of your little finger A gram is about the mass of a paper clip A kilogram is 2.2 pounds You drink 2 liters of pop See handout for other prefixes
Pflugerville ISD - August 20058 Tools for Measurement Meterstick Balance (triple beam and digital) Graduated Cylinder Stopwatch Thermometer Multimeter Photometer
Pflugerville ISD - August 20059 Graduated Cylinder Measurement Volume is measured using a graduated cylinder. When reading a graduated cylinder, read the bottom of the meniscus.
Pflugerville ISD - August 200510 Insert Slides on Dimensional Analysis From Bill Anderson, HHS
Pflugerville ISD - August 200511 K H D O D C M To change from one metric unit to another, we simply multiply by a conversion factor. For example: 25.4 km = _____________ cm? 25.4 km x 1000cm/1km = 2,540,000 cm
Pflugerville ISD - August 200512 Scientific Notation Rules: 1 digit before the decimal point Multiply the number by a power of 10 Example: Write 34,000 in scientific notation. Solution: 3.4 x 10 4
Pflugerville ISD - August 200513 Write the following in scientific notation: 4,100,000 = _______________ 345,600,000,000 = _________ 0.0456= ________________ 0.00000012=____________ O.00305= ____________ 4.1 x 10 6 3.456 x 10 11 4.56 x 10 -2 1.2 x 10 -7 3.05 x 10 -3
Pflugerville ISD - August 200514 Write the following in standard form: 4.67 x 10 3 =__________________ 3.112 x 10 5 = _________________ 3.112 x 10 -4 = ________________ 4 x 10 -6 = ___________________ 1 x 10 11 = __________________ 4670 311200 0.0003112 0.000004 100,000,000,000
Pflugerville ISD - August 200515 Density of Water One milliliter of water Has a mass of 1 gram Density = Mass ÷ Volume Calculate the density of water 1g ÷ 1mL = 1g/mL
Pflugerville ISD - August 200516 Measuring Water If you wanted to measure 25 mL of water, what instrument would you use?
Pflugerville ISD - August 200517 Measuring Water If you wanted to measure 25 grams of water, what 2 instruments could you use?
Pflugerville ISD - August 200518 Accuracy vs. Precision ACCURACY "capable of providing a correct reading or measurement.” A measurement is accurate if it correctly reflects the size of the thing being measured. PRECISION "exact, as in performance, execution, or amount.” It means repeatable, reliable, getting the same measurement each time.
Pflugerville ISD - August 200519 Try This On-line Activity http://www.learner.org/channel/courses/learningmath/me asurement/session2/part_c/accuracy.html
Pflugerville ISD - August 200520 Measuring volume of a solid by water displacement
Pflugerville ISD - August 200521 One cubic centimeter = One milliliter This cube’s sides are each 3 cm. What is the volume of the cube? Using water displacement, how many milliliters do you expect the water to raise when the cube is lowered?
Pflugerville ISD - August 200522 That’s all folks! Time to try some on your own!
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