2. The SI system International system Système international d'unités

3. A measurement system provides quantitative data Quantitative means a number is used. You are measuring a quantity. Qualitative data: It turned red It is cold It started steaming You are measuring a quality

4. Basic units Linear measurement: meter Mass: gram, but Kg is the standard Volume: liter Time: second Temperature: degrees Celsius Absolute temperature: Kelvins

5. Approximations 5 miles is about 8 Km Meter is about a yard 2.54 cm = 1 inch 1 paper clip is about 1 gram 22 pounds = 10 Kg 1 liter is about 1 quart 3.7 L = 1 gal

6. KHD_dcm

7. Best units Most sensible number Best accuracy

8. Types of measurements Direct Indirect