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Measurement

Measurement. Planetary Science. The metric system – system on measurement used in the scientific world. Length: meter Ruler / meter stick. 1 centimeter = 10 millimeters. What is the length of the line in centimeters? _______cm What is the length of the line in millimeters? _______mm.

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Measurement

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  1. Measurement Planetary Science

  2. The metric system – system on measurement used in the scientific world • Length: meter • Ruler / meter stick

  3. 1 centimeter = 10 millimeters What is the length of the line in centimeters? _______cm What is the length of the line in millimeters? _______mm What is the length of the line to the nearest centimeter? ________cm HINT: Round to the nearest centimeter – no decimals. Measuring Length How many millimeters are in 1 centimeter? 2.8 28 3 Ruler: http://www.k12math.com/math-concepts/measurement/ruler-cm.jpg

  4. Metric system • Mass: How many atoms are in an object • Not the same as weight!!! Weight = gravitational pull of an object • Units = Grams • Measured with 3-beam balance

  5. Once you have balanced the scale, you add up the amounts on each beam to find the total mass. What would be the mass of the object measured in the picture? _______ + ______ + _______ = ________ g Measuring Mass We will be using triple-beam balances to find the mass of various objects. The objects are placed on the scale and then you move the weights on the beams until you get the lines on the right-side of the scale to match up. 373.3 70 300 3.3 Top Image: http://www.southwestscales.com/Ohaus_Triple_Beam_750-SO.jpgBottom Image: http://www.regentsprep.org/Regents/biology/units/laboratory/graphics/triplebeambalance.jpg

  6. What is the total mass? Where should the riders be? 10 g 10 g 10 g 1 g 1 g 20 g 5 g 5 g 5 g 5 g 100 g

  7. What is the total mass? Where should the riders be? 172 g 10 g 10 g 10 g 1 g 1 g 20 g 5 g 5 g 5 g 5 g 100 g http://www.ohaus.com/products/education/weblab/TBBread.html

  8. Metric system • Volume: How much space an object takes up You can find the volume of liquids and solids. • Volume of Liquid : • Usually measured in milliliters • Graduated Cylinder

  9. Measuring Liquid Volume What is the volume of water in each cylinder? Images created at http://www.standards.dfes.gov.uk/primaryframework/downloads/SWF/measuring_cylinder.swf B = 37mL A = 52mL A B C C = 23mL Pay attention to the scales for each cylinder.

  10. Metric system • Volume of Solid (regular/geometric shaped): • Use formula: Length x Width x Height • Units usually cm3

  11. Metric system • Volume of Irregular Shaped Object: • Use water displacement method

  12. 9 cm 8 cm 10 cm We can measure the volume of irregular object using water displacement. Amount of H2O with object = ______About of H2O without object = ______Difference = Volume = ______ http://resources.edb.gov.hk/~s1sci/R_S1Science/sp/en/syllabus/unit14/new/testingmain1.htm Measuring Solid Volume We can measure the volume of regular object using the formula length x width x height. 9cm 720 cm 3 8 cm 10 cm _____ X _____ X _____ = _____ 260 mL 200 mL 60 cm3 *** Still solid object!! Click here for an online activity about volume. Choose Lessons  Volume & Displacement

  13. CONVERSION REMEMBER: King Henry Doesn’t Use Dirty Counterfeit Money

  14. 1 2 3 MetersLitersGrams How do you use the “ladder” method? 1st – Determine your starting point. 2nd – Count the “jumps” to your ending point. 3rd – Move the decimal the same number of jumps in the same direction. Starting Point Ending Point __. __. __. 2 3 1 Ladder Method KILO1000Units HECTO100Units DEKA10Units DECI0.1Unit CENTI0.01Unit MILLI0.001Unit 4 km = _________ m How many jumps does it take? 4. = 4000 m

  15. Compare using <, >, or =. 56 cm 6 m 7 g 698 mg Conversion Practice Try these conversions using the ladder method. 1 1,000 1,600 1000 mg = _______ g 1 L = _______ mL 160 cm = _______ mm 14 km = _______ m 109 g = _______ kg 250 m = _______ km 14,000 0.109 0.250 > <

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