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Understanding Measurement in Science: SI Units and Accuracy

In this engaging lab session, students will explore the critical concepts of measurement in science, focusing on the International System of Units (SI). Through hands-on activities, participants will assess accuracy and precision using examples related to mass, volume, length, and temperature. The session will encourage the selection of essential lab equipment and emphasize the importance of SI prefixes. Students will conclude with a reflective exit question to solidify their understanding of measurement principles vital for scientific practice.

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Understanding Measurement in Science: SI Units and Accuracy

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  1. Catalyst – August (30+1), 2009 • Of your 10 items that you are thinking about putting in your dream lab, pick one that measures something and describe what it measures. • Start Part 1 and Part 2 of the worksheet (6 questions) • You should have picked it up from the front lab bench on your way in!

  2. Today’s Agenda • Catalyst • Short Diagnostic and Reflection • Metric Units and Prefixes • Project Work Time • Exit Question

  3. Today’s Objectives • SWBAT identify SI units and SI prefixes.

  4. Projector Front Door 2nd Period Group 3 Katty, Whitnie, Nicolette, Chevalius Group 1 Neron, Tre, Denny, Chelsea J. Group 2 Darren, Isaac, Isaiah, Robin Group 6 Jared, Brittanee, T’Keyah, Rishad Group 5 Dorian, Elesha, Chelsea C., Chris Group 4 Keith, Jessica, Arethia, Sidne Group 9 Group 7 Kerrie, Jenny, Joseph, Juan Group 8 Timothy, Corian, Byron, Antonio

  5. Projector Front Door 4th Period Group 3 Tashica, Seandell, Kennesha, Lee Group 1 Brittanny V., Brandon, Katelynn, Queirra Group 2 Chelsea, Duan, Shant’a, Victoria Group 6 Darionne, Jordan J., Dajaelle, Kathy Group 4 Phillip, Jordan T., Keyera, Fatina Group 5 Frank, Amanda, Kevin, Brittany P. Group 7 Antrashion, Jayde, James Group 9 Kawanna, Davida, Cole Group 8 Brett, De’Jonnaie Stephanie, Tia,

  6. Measurement Notes Key Point #1: Science uses the International System of Units, also known as (SI) Why do you think scientists do this?

  7. UNITS • Volume uses Liters (L) or Milliliters (mL) • Mass uses Grams (g) • Length uses Meters (m) • Temperature uses Degrees Celsius (C)

  8. Measurement Notes Key Point #2: You can use prefixes to adjust the value of each of these units.

  9. Well fine… what are these prefixes?

  10. Well… ok, we generally only use a couple of them…

  11. Why? • Let’s use a milli- for an example, 10-3 • You can have a… • Milligram – one-thousandth of a gram • Millimeter – one-thousandth of a meter • Milliliter – one-thousandth of a liter • Millidegree Celsius – one-thousandth of a degree Celsius • If Lil’ Wayne was that rich, he’d be singing a mega, a mega, a mega…

  12. Now that we got measurement down, let’s talk about accuracy

  13. Accuracy • Key Point #3: Accuracy is how close you are to the correct or accepted value of a measurement. • Example: Throwing a dart close to the bulls eye • Example: If something is known to have a mass of 500 g and you measure 499 g

  14. Precision • Key Point #4: Precision is how close a series of measurements are to one another. • REPEATABILITY! • Ex: Throwing a dart and hitting the same spot 3 times in a row

  15. Good Accuracy Good Precision Good Accuracy Poor Precision Poor Accuracy Good Precision Poor Accuracy Poor Precision

  16. Precision/Accuracy Activity (15 min) • You will need a package of markers, a bullseye, and a ruler. • Follow directions and have fun.

  17. Work Time • Choices: • Finish picking out your lab equipment • Begin your sketches for your lab – rough draft is key! • Homework this weekend: • Finish Lab and Safety Equipment section • Complete rough draft of plans

  18. Exist Question Write down if it is good or bad accuracy (A) and precision (P). Explain how SI prefixes work.

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