For each student:
Student Activity Sheet for Learning Experience 12 (Please see PDF
For the class:
Clear plastic ziplock bag
Can of helium gas
Pin for balance
2 baskets for balance
Read the background information in the Properties Teacher’s
Manual. (Please see PDF
) Assemble the double pan balance. Use
a small piece of modeling clay on one end of the balance arm if needed to balance
the double pan balance. Fill half the balloons with air and fill the other half
with helium gas prior to class without the students knowing. Before filling the
balloon with helium, blow it up with lung air to stretch it. Let the air out
and then fill with helium.
Show the students a balloon filled with either air or
helium. Ask them to tell you how they could find out what is in the balloon.
Students will investigate properties of air and helium.
Can something you
can’t see have properties?
Demonstrate to students the properties of air by filling a
clear plastic ziplock bag with air using a straw.
Randomly distribute the balloons you have previously
inflated with helium and those inflated with air to the students. Have the
students release the balloons at the same time. Ask them to observe what
happens to the balloons. Students will record their observations on the activity
sheet for Learning Experience #12 in the Properties Student Activity Book. (Please see PDF
What happened to some of the balloons that did not happen to
the other balloons?
What was in the balloon?
What was in the plastic ziplock bag?
How do you know?
How is helium the same as air?
How is helium different than air?
Is a gas an object?
Place a balloon with air and one with helium on the double
pan balance. Observe which balloon is heavier. Have students label the balloon
that has the helium and air on the activity sheet for Learning Experience #12 in the Properties Student Activity
Book. (Please see PDF
For the accompanying Properties Student Activity
Book, please refer to the PDF found here. (Please see PDF)