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P2.4 Measurement and Safety
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P2.4 Measurement and Safety

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  • 1. Warmup  How would a standard system of measurements, agreed to and used around the world, make life easier? Give examples.
  • 2. Objectives: 1. Explain the importance of the International System of Units. 2. Determine the appropriate units to use for particular measurements. 3. Identify lab safety symbols, and determine what they mean.
  • 3. Making Measurements  The International System of Units (SI)  current name for the metric system. ○ Used by most scientists and almost all countries.  All SI units are based on the number 10.  Length  SI unit - meter (m).
  • 4.  Mass  Amount of matter that something is made of  SI unit - kilogram (kg)  Volume  Amount of space that something occupies  Liquids - liters (L) or milliliters (mL)  Solids - cubic meters (m3), cubic centimeters (cm3)
  • 5.  Density  Amount of matter in a given volume  SI unit – gram per milliliter (g/mL) or grams per cubic centimeter (g/cm3). ○ Derived quantity!  Temperature  measure of how hot (or cold) something is. ○ Scientists often use degrees Celsius (°C) as the unit. ○ SI base unit - Kelvins (K) d e n s ity m a s s v o lu m e
  • 6.  Area  measure of how much surface an object has  Formula for area of a square or a rectangle:
  • 7. Safety Rules  Always follow your teacher’s instructions.  Read lab procedures carefully and thoroughly.  Pay special attention to safety information and know the safety symbols.