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Volume – amount of space occupied by an object Length – distance between two points Mass – amount of matter in an object Time – period between two events Temperature – measure of the energy particles have Measuring Basics

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Measuring … … using Significant Figures!! Significant figures is used to show the accuracy in a measurement: Accuracy depends on the smallest increment shown on measuring tool (meter stick, balance, etc.) The last decimal place (digit) is an estimate The more decimals places (digits), the more accurate that measurement is

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Measuring 4 sided meter stick example

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The 3 steps to measuring with significant figures Think about a number 642.351 Hundreds, Tens, Ones, Tenths, Hundredths, Thousandths

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1. Determine the smallest increment on the measuring tool 1.Hundreds 2.Tens 3.Ones 4.Tenths 5.Hundredths 6.thousands What decimal place does each small line represent?

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2. Determine the next decimal place beyond that smallest increment ( Your measurement will be recorded to this decimal place) 1.Hundreds 2.Tens 3.Ones 4.Tenths 5.Hundredths 6.thousands What is the next decimal place?

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3. Record the measurement, estimating one decimal place past the smallest increment shown What is the proper measurement? 1.824 cm 2.82.4 cm 3.8.24 cm 4.8.240 cm 5.82 cm 6.8.2 cm

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The proper measurement: The Pencil is more than 8.2 cm long … … But less than 8.3 cm long … so we estimate to the next decimal place. 8.24cm The decimal places recorded shows accuracy of the measurement tool The measurement recorded is to the hundredths place, so we know the smallest increment was to the tenths

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Volume Graduated Cylinder

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Meniscus – read measurements at bottom of meniscus ? 7 Measuring Volume You always estimate one decimal place PAST the smallest increment shown

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Volume? 1.50.2 mL 2.50.28 mL 3.52.8 mL 4.52.80 mL 5.I have no idea

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Length Meter stick or Ruler

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Length? 1.8 mm 2.8.0 mm 3.8.00 mm 4.80 mm

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Now for the balance!!!

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Mass? 1.602005.72 2.200605.72 3.260.572 4.265.72 5.265.720 6.265.7

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Temperature º C = (º F - 32.0 º) º F = (º C) + 32.0 º K = º C + 273 Fahrenheit (º F ), Celsius (º C ), Kelvin (K) 5 9 9 5

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If you need extra help! Basic measuring practice

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MeasurementTaskAnswer (units) Volume Volume of water in small graduated cylinder mL More Volume Volume of water in large graduated cylinder mL Mass Mass of pen g Length Length of pen cm Temperature Temperature of water in graduated cylinder ºC

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Images Cited www2.oregonscientific.com http://www.labrecyclers.com/pics/ohaus_trip.jpg http://www.bourne.k12.ma.us/Class%20Links/Smith/Smith/images/tripple%20beam%20balance.jpg http://www.northernbrewer.com/pics/fullsize/lab-thermometer.jpg

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Significant Figures Revisited Let’s take a look at some instruments used to measure --Remember: the instrument limits how good your measurement is!!

Significant Figures Revisited Let’s take a look at some instruments used to measure --Remember: the instrument limits how good your measurement is!!

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