Proving/ disproving a gas law
How does the temperature affect the volume of a balloon?
Charles Law states that V1/T1 = V2/T2
V1 divided by T1= K
V1 divided by T1= K
V2 divided by T2 = K
V1T1 = V2T2
In the lab we are looking to find whether the Charles Law which states that V1/T1= V1/V2 is provable or not. For this the question is how effective does the temperature affect the volume of an item. If this relationship is equal with the temperature and volume then the Charles Law can and is provable. We are looking to find that the initial volume derived by us, and the initial room temperature equals the new volume divided by the freezer temperature. To prove the theory we will also apply heat to the ballon using a blow dryer to confirm that a higher temperature as well will affect the volume.
Safety Procedure and Equipment
Proceed with caution when using the hair dryer on the balloon as when exposed to extreme heat hand can possibly blister or burn. To prevent this situation, wear gloves as protection when exposing hands to extreme temperatures in the experiment.
- freezer (fridge will work to)
- gloves when exposed to the heat
- measuring tape
- paper/pencil to record #s
- calculator to test whether or not Charles Law can be proved
- black sharpie to draw a line around the ballon (circumference)
- stop watch
- Take and blow up a balloon to about 20-35 inches.
- Keeping the balloon in room temperature, take a black sharpie and draw a line around the balloon.
- Next grab a measuring tape and measure the initial circumference of the balloon in inches in room temperature.
- Find the volume using the initial circumference and volume formula (4/3 pi radius cubed).
- Then casually put the balloon in the freezer to see the change of temperature and volume.
- Keep it in the freeze for 3 minutes time this using a stopwatch.
- Next after 3 minutes of cold temperature take out the balloon from the fridge and measure the circumference once again using a measuring tape.
- Find the volume using the new circumference (4/3 pi radius cubed).
- You should see a decrease from the initial volume.
- Next plug in the numbers into the equation, V1 (initial size of the balloon) divided T1 (room temperature in fahrenheit) equals V2 (size of the balloon when taken out of the freezer) divided by T2 (temperature of the freezer in fahrenheit).
- If both numbers of the proportion are equal then this law was indeed true.
- To make sure temperature affects volume take the balloon thats been taken out of the freezer, use a blow dryer and apply heat on it for 20 seconds and the volume should increase since the temperatures did as well.
- Measuring the new volume it should be larger than the initial since the temperature increased.
- Find the volume.
- Now you should have one more proportion V1 (balloon volume) divided by V2 (temperature).
- Finally, justify the law by comparing and analyzing your data.