1. Systéme International d’unités (SI) International System of Units otherwise known as the metric system....

2. General Information International System of Units (SI) is a version of the metric system. SI is based on the powers of 10.

3. General Information Scientist world-wide have agreed to use SI to allow comparison of data and communication of results with each other.

4. Length Def: distance between two points Basic Unit: meter (m) Common Units: kilometer (km), meter (m), centimeter (cm), millimeter (mm)

5. Length Measurement tool: ruler, measuring tape, meter stick Common Conversions: 1 km = 1000 m, 1 m = 100 cm, 1 m = 1000 mm, 1 cm = 10 mm

6. Meter stick

7. Mass Def: the amount of matter an object contains. Basic Unit: kilogram (kg) Common Units: kilogram (kg), gram (g), milligram (mg)

8. Mass Measurement tools: pan balance, triple-beam balance, electronic balance Common conversions: 1 kg = 1000 g, 1 g = 1000 mg

9. Mass Weight: the pull of gravity on the mass of an object.

10. Pan balance

11. Triple-beam balance

12. Electronic balance

13. Volume Def: amount of space an object takes up Basic unit: liter (L) Common units: liter (L), milliliter (mL), cubic centimeter (cm 3 )

14. Volume Measurement tools: graduated cylinder, ruler (for rectangular solids) Common conversions: 1 L = 1000 mL, 1 mL = 1 cm 3

15. Volume - Reading a graduated cylinder Look at liquid level at eye level. Read at the bottom of the meniscus. Meniscus - the bottom of the curve of liquid in a graduated cylinder.

16. Looking at graduated cylinder witha meniscus

17. Volume - How to determine Rectangular solids: volume is determined by measuring height, width, and length and multiplying them together.

18. Rectangular solid measurements

19. Volume - How to determine Irregular solids: displacement of liquid (how much the water rises when an object is placed in the water.)

20. Volume by displacement

21. Time Basic unit: second (s) Common units: second (s), minute (min), hour (hr) Measurement tools: clock, watch

22. Common conversions: 1 hr = 60 min, 1 min = 60 s, 1 s = 1000 ms

23. Temperature Def: a measurement of the average kinetic energy of the molecules in an object. Basic unit: Kelvin (K) Common Units: Kelvin (K), Celsius (°C)

24. Temperature Measurement tool: thermometer Common conversions: 0 K = -273°C, 0°C = 273 K

25. Common temperatures: Water freezes - 0°C, Water boils - 100°C, Human body temperature - 37°C, Room temperature - 20°C