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Volume and Density

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					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?

				
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Jun Wang Jun Wang Dr
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