•12 Crystal Geyser Sparking Mineral Water
•2 mesh bags
•underwater paper and pencil
•waterproof timer (watch)
Making the Materials
1. The Carbon Dioxide Measurer
a. Empty one sparking water bottle.
b. Take a graduated cylinder and fill it up to 25 mL with water.
c. Pour the 25 mL in the empty water bottle.
d. Mark the 25 mL of water with a Sharpie on the water bottle.
e. Repeat filling the cylinder with 25 mL and pouring it into the bottle, marking each 25 mL.
f. Repeat marking the water bottle until 400 mL.
g. Attach the funnel to the top of the water bottle.
h. Hot glue the funnel to the top of the water bottle, then duct tape it, to secure a tight seal.
2. The Rope (to measure how deep we are)
a. Get a 20 foot rope.
b. Cut a pool noodle in half, then in half again so there are 2 quarters.
c. Hot glue the two quarters together.
d. Tie the top of the rope through the hole and tie it.
e. Duct tape the tubes together, making a flotation device for the rope to stay hanging down.
f. Take 10 washers and hot glue them together.
g. Tie the bottom of the rope to the washers, making a weight so the rope hangs down in the water.
h. Mark 5, 10, 15 feet with a Sharpie on the rope.
3. Clipboard and Paper
a. Print a table to record data on a water proof paper.
b. Attach the water proof paper to a clipboard.
c. Tie a string through the clipboard and in a loop, so that the recorder can attach the clipboard around their neck.
d. Attach a pencil with the rope, so it doesn’t float away.
Before Dive Day
1. Get all materials ready
a. Carbon Dioxide Measurer
b. 12 Crystal Geyser Sparkling Mineral Water (6 in 2 mesh bags)
d. Clipboard with Paper and Pencil
e. Underwater stopwatch
2. Test Control (for hypothesis)
a. Fill a plastic bin of water up to the top.
b. Put the Carbon Dioxide Measurer in the bin, making sure there it is filled with water, and no air is trapped inside.
c. Put a sparkling water under the funnel of the CO2 Measurer.
d. Unscrew the cap, letting the CO2 bubbles float into the measurer.
e. Let the bubbles release for 1 minute, then record the data.
f. Repeat for 3 trials.
Underwater on Dive Day
1. Prepare for Dive
a. Drop rope in the pool, near the wall.
b. Put all the gear in the mesh bags.
i. Sparkling water bottles, CO2 measurer.
c. Put watch around the wrist of the person holding the CO2 measurer.
d. Put on scuba gear.
2. Test at 5 feet
a. Go down to 5 feet by the wall.
b. Take out the CO2 measurer and one sparkling water bottles.
c. Make sure there is no air trapped in the CO2 measurer.
d. Set the bottom of the funnel at 5 feet.
e. Unscrew the cap under the funnel, so the bubbles float into the CO2 Measurer.
f. The person holding the CO2 measurer press start on the watch as cap unscrews.
g. Let the bubbles float for 30 seconds.
h. Once one minute is up, the person holding CO2 measurer slowly swim up to a snorkeler who will dive to grab the CO2 measurer.
i. The snorkeler carefully brings the measurer to the surface, then records the volume of CO2 on the paper.
ii. This needs to be done so that the only variable that is influencing the volume of the bubbles is Henry’s Law, not Boyle’s Law, so we test the volume at the surface not under water pressure.
j. The snorkeler gives the measurer back.
k. Test for 3 trials.
3. Test at 10 and 15 feet
a. Repeat steps for 5 feet, but go down 10 and 15 feet.
4. Test at 0 feet
a. Repeat steps for 5 feet. Test control in the pool.
Our results at Pali did not support the law, our hypothesis, and were inconclusive. We deduced that this is because some of the sparkling water bottles had been shaken, making them more carbonated than others. This made our data inconclusive. We decided that we are going to test again at the St. Matthew’s pool. We will test 0, 5, and 8 feet, with the same steps, making sure we are careful with the water bottles. We will also test a shaken trial, to prove that if the bottles were shaken the results would be different. Instead of having them in our bag, we will go up to the top and grab them, because we already have to go up to measure the volume of bubbles. We can do this without other people because we are not going as deep.