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SI Base Units

SI Base Units. SI Base Units. Prefixes to Memorize. Significant Digits Significant Figures. You will be asked to round to 3 significant figures But first you must know how to determine whether a number is considered significant. Rule 1. 1. All digits 1-9 are significant 789

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SI Base Units

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  1. SI Base Units

  2. SI Base Units

  3. Prefixes to Memorize .

  4. Significant DigitsSignificant Figures

  5. You will be asked to round to 3 significant figures But first you must know how to determine whether a number is considered significant

  6. Rule 1 • 1. All digits 1-9 are significant • 789 • 3 sig figs • 12587 • 5 sig figs • 1.234 • 4 sig figs

  7. Rule 2 ~ BETWEEN • Any zero between two significant digits is automatically significant • 1003 • 4 sig figs • 10.03 • 4 sig figs • 1,000,007 • 7 sig figs

  8. Rule 3 ~ FINAL ZERO • Any FINAL ZERO (after the decimal point) is significant. • 12.30 • 4 sig figs • 3.5768000 • 8 sig figs • 4.0 • 2 sig figs

  9. Any zero is insignificant if it is not between two sig digits nor the final zero after a decimal point. Theses zeros are called placeholders. Rule 4 ~ placeholder • 400 • 1 sig fig • 10000 • 1 sig fig • 789,600 • 4 sig figs • 0.00059 • 2 sig figs • 0.000590 • 3 sig figs

  10. Examples • 30040 grams • 4 sig figs • The last zero is not significant

  11. 0.663 kg • 3 sig figs • The zero only located the decimal point and is not significant

  12. 20.05 L • 4 sig figs

  13. 1500 mg • 4 sig figs • There is line over the final zero, so all digits are significant

  14. 0.0008 grams • 1 sig fig • The zeros are only place holders. They are not significant

  15. The End • Let’s practice!

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