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Metric System Length (L) Mass (M) Weight (W) Volume (V) Density (D) Temperature (T) Sand Meter Stick BalanceSpring ScaleGraduated Cylinder Mass/Volume Thermometer

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Learning Check What are some U.S. units that are used to measure each of the following? A. length B. volume C. weight D. temperature

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Solution Some possible answers are A. length inch, foot, yard, mile B. volume cup, teaspoon, gallon, pint, quart C. weight ounce, pound (lb), ton D. temperature F

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Stating a Measurement In every measurement there is a Number followed by a Unit from a measuring device The number should also be as precise as the measurement!

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The Metric System The metric system is based on the number 10 and multiples of 10. ---The Universal Language of Measurement--- Metric System – scientists & engineers use this language to communicate The metric system is often referred to as the International System of Units (abbreviated “SI”).

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Some Tools for Measurement Which tool(s) would you use to measure: A. temperature B. volume C. time D. weight

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Mass a measure of the amount of matter in an object Kilogram – the basic unit of mass in the metric system 1 kg = 1000 grams

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Weight a measure of the attraction between two objects due to gravity Newton (N) - the basic unit of weight in the metric system. a)The greater the mass, the greater the gravitational force. b)The greater the distance between the two objects, the weaker the gravitational force between them. The strength of the gravitational force between two objects depends on the masses of the objects and the distance between them: Gravity - a force of attraction between two masses.

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Mass vs. Weight A pineapple on earth weighs more than on the moon because the earth’s gravity is greater. But the pineapple’s mass always remains the same wherever you go (unless you get hungry and eat it!). The weight of an object changes as a result of changes in gravity. Weight is only present with gravity. An object has a universal mass, but may have different weight depending on gravity. The mass of an object does not change.

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http://www.wisc- online.com/objects/ViewObject.aspx?ID=g ch202http://www.wisc- online.com/objects/ViewObject.aspx?ID=g ch202

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THIS IS ALL UNDERLINED!!!

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http://www.ohaus.com/input/tuto rials/tbb/tbbentry.swf http://www.ohaus.com/input/tuto rials/tbb/TBBread.html

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Volume The amount of space an object takes up Liter – is the basic unit of volume in the metric system 1 Liter = 1 L 1cm 1 cm 3 = 1 mL 1cm Milliliters and Liters are used to measure the volume of Cubic centimeters – is the metric unit used to measure the volume ofLxWxH= volume of a regular solid. A cubic centimeter is equal to the volume of a cube that measures 1 cm by 1 cm by 1 cm (cm 3 ). A volume of a cubic centimeter (cm 3 ) is exactly equal to the volume of one milliliter.

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The instrument used to measure volume is a graduated cylinder.

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The curve in the top surface of the water in a graduated cylinder. Meniscus

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Read the ml marking at the bottom of the curve. What is the proper way to read a meniscus?

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How much fluid is in this cylinder?

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Volume Practice http://www.wisc- online.com/objects/ViewObject.aspx?ID=g ch302http://www.wisc- online.com/objects/ViewObject.aspx?ID=g ch302

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Volume of an irregular shaped object Start with a known amount of water. Slowly drop the object into the cylinder. Measure just how much the water goes up.

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What is the volume of this object?

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Density a measure of the amount of matter that occupies a unit certain volume If lighter fluids float on heavier fluids, do you expect water to float on oil? The density of oil = 0.91 g/mL Sinks > 1 g/ml Floats < 1 g/ml The density of water = 1.00 g/mL Density = mass/volume (units are usually g/mL)

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Sand grains If the human body is nearly 70% water, is it possible to float in quicksand? Should you get worried?

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Length The distance between two points Meter – the basic unit of length in the metric system 1 meter = 1 m

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Using a Ruler

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The Distance between the two lines is one centimeter (cm)

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The Distance between the two lines is one millimeter (mm)

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What is the distance between the two lines ?

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5 cm

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Ruler Practice http://www.funbrain.com/cgi- bin/meas.cgi?A1=s&A2=1&A3=2http://www.funbrain.com/cgi- bin/meas.cgi?A1=s&A2=1&A3=2 http://www.wisc- online.com/objects/viewobject.aspx?id=ab m4202http://www.wisc- online.com/objects/viewobject.aspx?id=ab m4202

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Temperature a measure of heat energy Celsius = a unit of temperature in the metric system Water freezes at 0° C. Water boils at 100° C. Normal body temperature is 37° C Room temperature is 21° C.

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Temperature Conversions ! Celsius to Fahrenheit F=(C x 9/5) + 32 Fahrenheit to Celsius C=(F-32) x 5/9

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What is the temperature?

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Temperature Fun http://www.mathsisfun.com/measure/therm ometer.htmlhttp://www.mathsisfun.com/measure/therm ometer.html

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Metric Prefixes PrefixSymbolMeaning kilo-k1000thousand hecto-h200hundred deka-da10ten deci-d0.1tenth centi-c0.01hundredth milli-m0.001thousandth

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Some Tools for Measurement Which tool(s) would you use to measure: A. temperature B. volume C. time D. weight

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Learning Check Match L) length M) mass V) volume ____ A. A bag of tomatoes is 4.6 kg. ____ B. A person is 2.0 m tall. ____ C. A medication contains 0.50 g Aspirin. ____ D. A bottle contains 1.5 L of water. M L M V

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Learning Check Select the unit you would use to measure 1. Your height a) millimeters b) meters c) kilometers 2. Your mass a) milligramsb) grams c) kilograms 3. The distance between two cities a) millimetersb) meters c) kilometers 4. The width of an artery a) millimetersb) meters c) kilometers

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Solution 1. Your height b) meters 2. Your mass c) kilograms 3. The distance between two cities c) kilometers 4. The width of an artery a) millimeters

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