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Ch02b using si units

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• 1. Unit 1
Using SI Units
• 2. Measurement Standard
An exact quantity that people agree to use for comparison.
* helps you get the same answer as other people
• 3. What was used as the earliest measurement standards?
Body Parts
* The question then, is WHO’S body parts?
The KING’S or QUEEN’S
• 4. Is your hand or a body part a good standard of measurement?
* no
* people’s hands are not the same size
* get different answers
• 5. In order for any measurement to MAKE SENSE; two things must be included.
1.) a number
2.) a unit
• 6. Every type of measurement has a base or central unit.
* meter (distance or length)
* liter (volume)
* gram (mass)
* second (time)
• 7. Adding a prefix to a base (central) unit, you can create a whole new unit to measure any object.
• 8. Prefixes Used When Measuring:
Large Objects
kilo = 103
hecto = 102
deka = 101
Small Objects
deci = 10-1
centi = 10-2
milli = 10-3
• 9. Measurements that can be made
Length
Mass
Temperature
Time
Area
Volume
Density
Weight
• 10. Length
The distance between two points.
Base (central) units of length
* (US) FOOT [ft]
* (SI) METER [m]
• 11. Length
Length of an object or the distance between two points is measured using a METERSTICK.
• 12. Mass
“A body of coherent matter.”
* a collection of stuff joined to form an object
Base (central) units of mass
* (US) SLUG [slug]
* (SI) KILOGRAM [kg]
sometimes gram [g]
• 13. Mass
Mass is measured using a BALANCE.
• 14. Temperature
Measurement of how hot or cold something is.
• 15. Temperature
Base (central) units of temperature
* (US) FAHRENHEIT [oF]
* (SI) CELCIUS [oC]
> (SI) KELVIN [K]
* this is an absolute scale
• 16. Temperature
Temperature is measured using a THERMOMETER.
• 17. Absolute Zero
The coldest possible temperature.
* temperature where ALL motion stops
* 0 Kelvin
* found by the formula:
K = oC + 273.16
• 18. Time
Interval between two events.
Base (central) units of time
* (US) SECOND [s]
* (SI) SECOND [s]
• 19. Time
Time can be measured using a CLOCK or a CALENDAR.
• 20. Derived Units
Obtained by combining multiple units of measurement.
• 21. Area
The amount of surface included in a set of boundaries.
Found by the formula:
* Area = lengthx width
• 22. Area
What is the difference between length and width?
DIRECTION
• 23. Area
Base units of area
* (US) FEET SQUARED [ft2]
* (SI) METERS SQUARED[m2]
• 24. Volume
The amount of space an object occupies.
Easy with liquids & gases, harder with solids
* for a solid you may need the formula:
volume = l x w x h
• 25. Volume
For a liquid or a gas all you need is a devise that is designed to measure volume.
* a beaker, a flask or a graduated cylinder
• 26. Volume
Base (central) units of volume
* (US) GALLON [gal]
* (SI) LITER [L]
sometimes centimeters cubed [cm3]
• 27. Volume
1 milliliter equals
1 centimeter cubed.
* 1 mL = 1 cm3
• 28. Density
The measurement of how thick, compact and solid an object is.
Relationship between the mass & volume of an object
• 29. Density
Found by the formula:
* Density = mass ÷ volume
Expressed in g/Lorg/cm3
* a mass unit / a volume unit
• 30. Weight
Measurement of the force of gravity pulling on the mass of an object.
Changes as gravity changes.
Base units of weight
* (US) POUND [lb]
* (SI) NEWTON [N]
• 31. Weight
Weight is measured using a SPRING SCALE.
• 32. MASS and WEIGHT are NOT the same thing!
• 33. Physical Properties
Characteristics of a substance that can be used to identify it.
Color
Shape
Texture
State of matter
Size
All measurements
(changing a physical property does NOT change the substance)
• 34. The End