Measurement and Safety In Physical Science

1
Measurement and Safety In Physical Science

• Section 4 pg. 24-27

2
The International System of Units
3

• King Henry Died, Mother Didnt Care Much
• Kilo, Hecto, Deca, Meters, Deci, Centi, Milli
• Mm thickness of your fingernail
• cm width of your pinky
• decimeter approx. width of your hand including
  your thumb
• meter width is approx shoulder to tip of your
  hand
• Decameter about a school bus length
• hectometer about as long as a football field
  including the end zones
• Kilometer is about 2 times around the school on
  the dirt road

4
Volume

• The amount of space taken up by an object
• Measured with a graduated cylinder- liquid
• v L x W x H (length x width x height)
• When measuring a solid
• To determine the volume of an irregular shaped
  solid you must
• Fill the graduated cylinder about half full,
  record the volume of JUST the water
• Add the solid to the graduated cylinder, record
  the volume
• Subtract the volume of the water from that total
  and you have the total volume of your irregular
  shaped object!
• The unit is CM³

5
Temperature

• C or K (Celsius or Kelvin)
• Each segment on a Celsius thermometer is equal to
  1 degree.
• The number that is lined up to the red liquid is
  the temperature (after it stops)
• C (F 32) x 5/9
• F (C x 9/5) 32

6
Mass

• The SI unit is usually kilograms (kg)
• Grams are used to express the mass of SMALL
  objects
• The mass of very large objects is expressed in
  metric tons (1,000 kg)

7
Area

• The measure of how much surface an object has
• To calculate the area of a rectangle, measure the
  length, and width and use this equation
• The unit is m², cm², or km²

8
Density

• Density is mass per unit volume
• An objects density is the amount of matter it has
  in a given space
• To find density (D), first measure mass (m) and
  volume (V), then use the following equation

9
LAB SAFETY

• Always follow your teachers directions, NEVER
  take shortcuts- even when you think there is
  little or no danger involved!
• Get teachers permission and read lab procedures
  carefully before starting a lab!
• Pay particularly close attention to safety
  information and caution statements!
• KNOW the symbols on page 27 in your book AND on
  the wall! ?
• KNOW what they mean!!!
• If you are unsure, ASK ME!

10
LAB RULES

• Conduct yourself in a responsible manner-
  Horseplay, practical jokes and pranks will NOT be
  tolerated.
• Follow ALL written and verbal rules as given by
  the teacher.
• Do NOT touch ANY equipment UNLESS told OTHERWISE!
  Wait until you are given permission!
• Perform only authorized and approved experiments!
• NEVER eat, drink, chew gum or taste ANYTHING
  while in the lab areas!
• Keep your hands away from your face, eyes and
  mouth while using chemicals!
• Keep your work area CLEAN! Bring ONLY your lab
  instructions, worksheets and writing utensils to
  the lab areas!

11
LAB RULES

• Follow your teachers instructions to dispose of
  any waste materials generated in experiment!
• Report ANY accident, injury, or hazardous
  condition to the teacher IMMEDIATELY!
• Consider ALL chemicals DANGEROUS! Do not touch or
  smell anything unless you are TOLD to!
• Always carry a microscope with TWO hands!
• Never open ANY storage cabinets or enter the
  prep/storage room without permission from the
  teacher!
• Dress appropriately- no loose or baggy clothing!
  No dangling jewelry and aprons must be worn!
• Make sure your hair is ALWAYS pulled back if it
  is long!
• Learn where the safety equipment is and how to
  use it!