SCUBA DIVE! 1. To determine what volume of air is required to make a dive for 30 minutes I chose jogging on a treadmill to substitute for exercise during swimming. I timed my running for 5 minutes.While my heart rate was still increased I calculated how many breaths I used to fill a beach ball which was 16 inches in diameter.I calculated the volume of the beach ball to show me how much air was used for one minute. I then multiplied that number by 30 to get the total amount of air and breaths needed for a 30 minute dive.I also know that the air tank can only hold 3319.5cm^3 of air so I used Boyle's law to find what pressure was needed for the amount of air needed to be held by the tank. 2. I found the total volume of air required for a 30 minute dive to be 316,101cm^3.

The circumference of the beach ball is 85.7 cm. I multiplied this number by .5, then divided by pi and got a radius of 13.6 cm.

Then i put the radius of the beach ball in to the volume of a sphere formula, and calculated the volume to 10,536.7 cm^3.

I counted 45 breaths to fill up the entire beach ball witch means each breath was about 215 cm^3.

In one minute I filled the beach ball with 45 breaths. I multiplied this number by 30 to find how much air we would need for the entire 30 minutes, and got about 315,500 cm^3.

If I take 45 breaths in one minute, I would take about 1350 breaths in 30 minutes. 3. I used Boyles' Gas Law for my Experiment I will be using is Boyles' Law to find out the amount of pressure tank be will under. The Law is

P1/V1=P2/V2. Trial 1:

Running Time in minutes- 5:00

Heart rate per minute- 60

Circumference- 85.7cm

Radius- 13.6 cm

Volume- 10536.7 cm^3

Breaths- 45 breaths

Breathing Time- 1 minute

Trial 2:

Running time in minutes- 5:00

Heart Rate per minute- 63

Circumference- 85.7cm

Radius- 13.6cm

Volume- 10536.7 cm^3

Breaths- 46 breaths

Breathing Time- 1 minute Experiment: 4. The amount of air you would need to compress on a 30 minute dive at 1 atm I found to be about 318,000cm^3. 5. When water temperatures are different the pressures' of both are aswell. The pressure in Florida would be higher then in Maine.

Water temperature below the body temperature draws heat from the body. Muscles can cramp in extreme cold water that can result into serious illness or death. It's important to have proper thermal protection such as wet suits to avoid hypothermia. 6. 8. An overfilled scuba tank that's left in sun on a hot day causes air to expand and will heat up. The temperature will cause the molecules in the tank to move faster. The increase of motion raises the pressure inside that an explosion would be the result. 7.As you go down deeper the pressure increases and the tanks have to be pressurized or else they would explode, or you run out of air extremely fast. 9. If you suddenly depressurize an airplane cabin the passengers would run out air extremely fast. Also if the pressure is high enough peoples' eyes will pop out, and if its higher it would crush people and they would die. In a real situation people would get light headed then pass out due to lack of oxygen. Alex Leos

per.3 The final pressure of the tank will be around 144 atm

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# SCUBA DIVE!

By: Michael Alexander Leos