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Density of popcorn

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					Name:____________________
                      Density of Popcorn
Objective: To measure to density of popcorn before and after popping.
Materials: un-popped corn, paper bag, clean computer paper, paper cups
Procedure:
    Measure and record the mass of an empty cup and an empty paper bag.
    Pour the un-popped popcorn into a plastic cup.
    Measure the mass of the cup filled with popcorn.
    Tap the cup so that it settles and make a mark on the outside of the cup to
      mark the height of the popcorn.
    Measure the volume of the cup up to the mark by measuring the volume of
      water needed to fill the cup to the line.
    Pop the popcorn in either a hot air popper or a microwave. Note the type
      of popping: hot air or microwave.
    Measure the mass of the popped popcorn in the bag.
    Tap the bag so that it settles and make a mark on the outside of the bag to
      mark the height of the popcorn.
    Calculate the volume of the popcorn using the length, width and height of
      the bag.

                                                        Volume
                           Mass of cup                              Density of
               Mass of                       Mass of     of un-
                              and                                   un-popped
              empty cup                      popcorn    popped
                            popcorn                                  popcorn
                                                        popcorn
   Before
  Popping

                                                        Volume
                           Mass of bag
               Mass of                       Mass of      of         Density of
                              and
              empty bag                      popcorn    popped        popcorn
                            popcorn
                                                        popcorn
   After
  Popping
                           Type of popping

    Fill in the chart on the other side of this paper with your classmates’
     volumes and masses of un-popped and popped popcorn.
    Use the data to make an excel chart showing mass vs volume with two
     lines: one for un-popped and one for popped.
             Hot Air             Un-popped                      Popped
 Group       (HA) or
 Name       microwave        Mass         Volume         Mass         Volume
              (MW)




1. Make a conclusion to this experiment explaining the relationships between
mass, volume and density both before and after popping.



2. Without measuring, estimate what would be the density of one popped kernel
of your popcorn and explain how you came to that estimation?

				
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posted:4/10/2010
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Jun Wang Jun Wang Dr
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