1. Chapter 1
Using SI Units

2. Every type of quantity measured has a base unit and a symbol.

3. Using the prefixes and the base units, you can determine the unit you will need to use to measure any object.

4. Length The distance between two points. Base units of length
* (US) FEET [ft]
* (SI) METERS [m]

5. Mass “A body of coherent matter.”
* a collection of stuff joined to form an object
Base units of mass
* (US) SLUGS [slugs]
* (SI) KILOGRAMS [kg]
sometimes grams [g]

6. Measurement of how hot or cold something is.
Temperature
Measurement of how hot or cold something is.

7. Temperature Base units of temperature * (US) FAHRENHEIT [oF]
* (SI) CELCIUS [oC]
> (SI) KELVIN [K]
* this is an absolute scale

8. Absolute Zero The coldest possible temperature.
* temperature where ALL motion stops
* 0K
* found by the formula:
K = oC

9. Time Interval between two events. Base units of time * (US) SECOND [s]
* (SI) SECOND [s]

10. Derived Units
Obtained by combining multiple SI units.

11. Area The amount of surface included in a set of boundaries.
Found by the formula:
* Area = length X width
Base units of area
* (US) SQUARE FEET [ft2]
* (SI) SQUARE METERS [m2]

12. Volume The amount of space an object occupies.
Easy with liquids & gases, harder with solids

13. Volume Base units of volume * (US) GALLONS [gals] * (SI) LITERS [L]
sometimes centimeters cubed [cm3]

14. Volume
1 milliliter equals
1 centimeter cubed.
* 1 mL = 1 cm3

15. Density Measurement of how thick, compact and solid an object is.
Relationship between the mass & volume of an object
Found by the formula:
* Density = mass ÷ volume
Expressed g/L or g/cm3

16. Weight
Measurement of the force of gravity pulling on the mass of an object.
Changes as gravity changes.
Base units of weight
* (US) POUNDS [lbs]
* (SI) NEWTONS [N]

17. MASS and WEIGHT are NOT the same thing!

18. Because the SI system is based on units of 10 it is easier to convert in.

19. 4 Steps to Easy Conversions
1.) FIND out where you are on the chart.
2.) LOCATE the decimal in the number.

20. 4 Steps to Easy Conversions
3.) COUNT the places you have to move to end up where you need to be.
4.) MOVE the decimal that many places in that direction.
* add zeros as needed

21. The End