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Topic: Measurements and Density

Topic: Measurements and Density. Time. Rate at which something happens Instruments : Stop watch, clock Units : seconds, minutes, hour, days. Length. Distance between two points Instruments : Ruler, Meter Stick Units : feet, miles, meter, kilometer 5,280 feet = 1 mile = 1.6 kilometer.

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Topic: Measurements and Density

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  1. Topic: Measurements and Density

  2. Time • Rate at which something happens • Instruments: Stop watch, clock • Units: seconds, minutes, hour, days

  3. Length • Distance between two points • Instruments: Ruler, Meter Stick • Units: feet, miles, meter, kilometer 5,280 feet = 1 mile = 1.6 kilometer

  4. Metric System Kilometer Hectometer Decameter Meter Decimeter Based on a Factor of 10 Centimeter Millimeter

  5. Reading a metric ruler correctly: This point can be read as 6.70 cm. or 67.0 mm.

  6. More Practice! - - -

  7. Temperature • Average kinetic energy in a sample • Instruments: thermometer • Units: °F, °C, ˚K • ESRT pg 13

  8. Mass • Amount of matter in an object • Instruments: Electronic Scale • Units: grams

  9. Mass vs. Weight • Mass - amount of molecules in an object. • Weight - effect of gravity on mass

  10. The Moon’s gravity is 1/6th of the Earth’s If you weight 130 pounds on Earth, on the Moon you would weigh 21.7 lbs. Space suit worn by astronauts weighed 180 pounds on Earth and 30 pounds on the Moon with the reduced lunar gravity. Think of Astronauts

  11. Volume • Amount of space something takes up • Instruments: graduated cylinder, ruler • Units: ml, cm3 • V = LxWxH

  12. Measuring Volume Width Length Height

  13. Measuring Volume

  14. Just Right

  15. Practice -

  16. How do you measure volume for an irregular object? Water Displacement Method Meniscus

  17. Measuring Volume Volume with object How do we measure volume of a irregular object? Original Volume Always read the meniscus

  18. When Stating a Measurement Remember the… cm 0C cm3 ml sec. g Units

  19. FQ • What is the volume of this rock?

  20. Topic: Density changes with Temperature & Pressure

  21. Density - ESRT pg 1 - Density = mass/volume Units = g/cm3 or g/ml

  22. Density Triangle

  23. Phases Of Matter

  24. Phases of Matter • In most cases • Solids are - • Liquids are - • Gases are - • The exception is water because -

  25. When volume is constant (same)… • Mass decreases, - • Mass increases, -

  26. Question If a uniform substance has a mass of 18 g, volume 6 cm3. If cut exactly in half, what happens to the density? *__

  27. As temperature increases, -

  28. When mass is constant (same)… • Volume decreases (compacts), atoms are closer together - • Volume increases (expands), atoms are farther apart, -

  29. Air cools Density Increases Air sinks Convection – - Warm air Lower Density Air Rises Heater

  30. Pressure Pressure -

  31. Pressure increases, volume decreases, -

  32. Pressure decreases, volume increases -

  33. Lets test it !!!!

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