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Thermal Expansion Lab
Question: What is the effect of temperature on the volume of a gas?
Materials:
3 rulers
Ice chest (with ice)
Hot plate with a beaker of boiling water
Red (hot) balloons
Blue (cold) balloons
Procedure:
1.
Measure the diameter of the balloon at your station. Use the 3-ruler method…place one ruler
on the lab counter (this is the measuring ruler). Place another ruler vertically and on the zero
mark of the first ruler. Place the balloon next to the vertical ruler. Place the third ruler vertically
on the other side of the balloon. Be sure the rulers are as straight as you can make them. Read
the measurement indicated by the second vertical ruler. This is the diameter of your balloon.
2.
Divide the diameter of your balloon in half…this is the radius of the balloon. Record in your data
table.
3.
Calculate the volume of your balloon by using the formula in your data table.
4.
If you have a cold balloon, put it in the ice chest for 2 minutes. Get all of your rulers set up and
ready, and immediately measure the diameter of the cold balloon. Repeat steps 3 and 4.
5.
If you have a hot balloon, hold it over the beaker of boiling water for 1 minute (do not touch the
balloon to the hot glass beaker!). Get all of your rulers set up and ready and immediately
measure the diameter of the hot balloon. Repeat steps 3 and 4.
6.
Repeat the procedure for the other temperature if you have time. If not, exchange your data
with a group who did the other temperature.
PLEASE DO NOT WRITE ON THIS PAGE!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Thermal Expansion Lab
Question: What is the effect of temperature on the volume of a gas?
Hypothesis: Write a hypothesis in the if-then-because format.
Data: Copy the data tables below and record your data.
DATA TABLE #1: HOT
TEMP OF
BALLOON
Radius
r = d/2
Volume
V = 4/3 π r3
Radius
r = d/2
Volume
V = 4/3 π r3
Room Temperature
Hot Balloon
DATA TABLE #2: COLD
TEMP OF
BALLOON
Room Temperature
Cold Balloon
Observations:
Draw a diagram to show the particles in the hot and the cold balloon.
Conclusion:
1.
Summarize your results. What is the relationship between temperature and volume? Use
science to explain why you got these results.
2.
Describe how we could make this experiment more accurate.