Name ____________________________________Period_______Lab#_______ Volume and Density Volume The word volume has many meanings in American society. On the way to school you may have turned up the volume on the car stereo or recently seen an ad to increase the volume of your hair. In science, the word volume has an entirely different meaning that helps to describe something very important, density. Volume _____________________________________________________________ How do you calculate volume? There are many ways to find an objects volume. One way involves taking measurements and using an equation. The two formulas you will use are: Volume of a cube: v=lxwxh Volume of a cylinder: v = π r2 h Direct Method Example: CUBE l _____________ w______________ h______________ Formula__________________ Plug in___________________________ = ________________ CYLINDER r ____________ h____________ Formula__________________ Plug in_______________________________________ = ______________ A. DIRECT METHOD 1. Find the measurements for the wooden block (don’t forget units) l ________ w _________ h ___________ 2. Calculate the volume the wooden block: a. Block # ______ Formula :______________ Plug in _________________________ = _________________ Name ____________________________________Period_______Lab#_______ 3. Find the measurements for the stack of 16 pennies. r ________ h________ 4. Find the Volume of the stack of pennies Formula :______________ Plug in _________________________ = _________________ When you are unable to directly measure an object you can determine volume indirectly using a method called displacement. To do this, fill up a graduated cylinder with water to a known point, drop the object in and the amount that has changed is the volume. Indirect Method Example: ODD SHAPED OBJECT Initial Volume ______________ New Volume ________________ Change in Volume (New-Change) ______________________ B. INDIRECT METHOD 5. What are the units for the graduated cylinder? _______ 6. Find the volume of the stack of pennies using this technique. Initial Volume ____________ New Volume ____________ *Change in Volume______________ 7. Find the volume for the ½ stack of pennies. Initial Volume ___________ New Volume *Change in Volume ________________ Density Density is an important concept in Earth Science it controls the way something will behave. For example, oil floats on top of water because it is less dense. o Density combines both mass and volume. o Volume changes with size. o Mass is the amount of matter something has, very similar to weight. Mass also changes with an objects size. You measure mass with a scale. o The density, however, does not change with size. o For example water has a density of 1g/cm3 no matter how much of it you have. Density _________________________________________________________________ The formula for density is _____________The units for density are ________ OR _______ Example: CYLINDER: Mass _______________ Volume________________ Formula _____________________ Plug in ______________________ = __________________ Will this object sink or float? Why? C. FINDING DENSITY 8. Find the density of the block: Mass _______________ Volume________________ Formula _____________________ Plug in ______________________ = __________________ 9. Find the density of the stack of pennies: Mass _______________ Volume________________ Formula _____________________ Plug in ______________________ = __________________ 10. Find the density of the ½ stack of pennies: Mass _______________ Volume________________ Formula _____________________ Plug in ______________________ = __________________ D. Data Table Mass Volume Volume Density *(Indirect) Block # _________ Stack of Pennies ½ Stack of Pennies ** Don’t forget the units! E. Summary Questions 11. Does the block sink or float? ____________________ 12. Do the pennies sink or float? ___________________ 13. The density of water is 1g/ml, when does something float in water? 14. When does something sink? 15. Compare/Contrast the volume of the stack of pennies vs. the ½ stack. 16. Compare/Contrast the volume of the stack of pennies vs. the ½ stack. a. Why is that the case?