2. C0L2P1 Scientific Measurement

3. In science what units are internationally accepted? Why should you use significant digits? How do I use the metric system? Measurement and Scientific Tools Essential Questions

4. Measurement and Scientific Tools The International System of Units The International System of Units (SI) is an internationally accepted system for measurement.International System of Units (SI) The International System of Units is the modern form of the metric system, and is the most widely used system of measurement.

5. Reasons why scientists use the International System of Units (SI).? So all scientists regardless of what country they're in can do the experiment and know how much of a specific substance to use. So calculations done in one country could be understood by a scientist living in another country.

6. Measurement and Scientific Tools The International System of Units All SI units are derived from seven base units.

7. The International System of Units (cont.) A prefix can be added to a base unit’s name to indicate either a fraction or a multiple of that base unit. Prefixes are based on powers of ten, such as 0.01 and 100.

8. Measurement and Scientific Tools Measurement and Accuracy All measurements have some uncertainty. The tools used to make measurements limit the accuracy of the measurements.

9. Measurement and Scientific Tools Significant Digits Significant digits are the number of digits in a measurement that are known with a certain degree of reliability. Significant digits The significant digits in a measurement include all digits you know for certain plus one estimated digit.

10. Measurement and Scientific Tools Significant Digits

11. Measurement and Scientific Tools Significant Digits (cont.) Using significant digits lets others know how certain your measurements are.

12. Measurement and Scientific Tools Metric System The metric system is a measurement system based on our decimal (base 10) number system.

13. Measurement and Scientific Tools Metric Prefixes PrefixSymbolFactor NumberFactor Word Kilo-k1000Thousand Hecto-h100Hundred Deca-da or dk10Ten Unitm, l, or g1One Deci-d.1Tenth Centi-c.01Hundredth Milli-m.001thousandth

14. Measurement and Scientific Tools Place Values of Metric Prefixes Thousand Hundred Ten One Tenth Hundredth Thousandth km kg kL hm hg hL dkm dkg dkL mgLmgL dm dg dL cm cg cL mm mg mL

15. Measurement and Scientific Tools Changing Metric Units To change from one unit to another in the metric system you simply multiply or divide by a power of 10.

16. Measurement and Scientific Tools Place Value of Metric Prefixes Move the decimal point to the right to multiply. Thousand Hundred Ten One Tenth Hundredth Thousandth km kL kg hm hL hg dkm dkL dkg mLgmLg dm dL dg cm cL cg mm mL mg

17. Measurement and Scientific Tools Place Value of Metric Prefixes Thousand Hundred Ten One Tenth Hundredth Thousandth km kL kg hm hL hg dkm dkL dkg mLgmLg dm dL dg cm cL cg mm mL mg Move the decimal point to the left to divide.