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Understanding Measurement: SI Units, Accuracy, and Precision in Everyday Life

This guide explores the fundamentals of measurement without tools by discussing the height of doors, the width of rooms, and the weight of everyday items. It delves into the SI System of Units, known as Systeme International d'Unites, which simplifies measurements through multiples of ten. The importance of standard units is highlighted, along with definitions of length, mass, temperature, time, and volume units. Additionally, it defines accuracy vs. precision, discussing their relevance and factors affecting them in daily transactions and activities.

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Understanding Measurement: SI Units, Accuracy, and Precision in Everyday Life

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Presentation Transcript

  1. Measurement

  2. Measure the following without using any measuring tool. a. height of the door b. width of the room c. thickness of chemistry book d. weight of pilot ballpen e. mass of board marker

  3. What is SI System of units?

  4. SI System of Units • also known as Systeme International d’Unites • a modified form of the metric system and is generally a system of units of measurement • simple and convenient to use since all units are based on multiples of 10.

  5. What is the SI unit for: Length? Mass? Temperature? Time? Amount of substance? Luminous intensity? Volume?

  6. Formula - Temperature: °C= 5/9 (°F-32) °F=9/5 (°C+32) K= °C + 273 °C= K-273

  7. What is the importance of having standard units of measurement?

  8. Synthesizing

  9. Self-check: Give examples of transactions or activities in our country which make use of metric system.

  10. Accuracy and Precision

  11. Precision is the degree of agreement between different values obtained under basically the same conditions; it is a measure of the degree with which measurements agree; is how close the measured values are to each other. • Accuracy is the degree of agreement between the experimental result and the true value; is how close a measured value is to the actual (true) value.

  12. True Value=1.000 g/mL

  13. Examples of Precision and Accuracy:

  14. Factors affecting accuracy and precision • Human error • Condition of equipment • Quality of materials used • Environmental conditions such as temperature and pressure

  15. Complete the given speculation about effect journal regarding measurement:

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