# Underwater Diving Plan – Assignment Instructions

### Part 1

You are to make a plan for underwater diving in a self-contained diving suit. your plan would include a diagram that represents the diving depth in relation to the decompression level for diving on air; the number of air containers needed to have a safe expedition; a recommendation for a relevant use of an enriched air mixture of dioxygen (nitrox); at what precise maximum percentage of the air mixture should be used.

Diver profile:

Diver profile:

- Container characteristics:air consumption on the surface: 20L/min Internal volume: 16L
- the purpose: to collect some samples Internal presssure: 23000 kPa
- max depth to reach: 35 m mass of an empty container: 19.8 kg
- atmospheric pressure: 100 kPa Estimated length of time to water temp: 20 degrees C collect: 60 min

- what is the function of an underwater diving container?
- what is a level of decompression?
- what other questions will help you get more info on this project?
- give, in chronological order, the principal stages of this project.

### Part 2

Gathering information:

- What are the 4 variables that characterize a sample of gas?
- How does the pressure of a gas vary in relation to water depth?
- How do you calculate the pressure od a given underwater depth?
- What it the pressure exerted on a diver at 30m? explain.
- what parts of the body are most affected by the variations of pressure when diving? explain.
- What are the formulas that pertain to the 4 variables that characterize gas? Indicate what each variable represents and the units used

### Part 3

- If a diver holds his breath, what is the change in the volume of air in his lungs as he decends? Explain.
- Why is it important not to hold your breath when going back up the surface?
- What should the diver do to conserve the same respiratory volume on the surface?
- What is the result of this action on the concentration of air in the lungs? Explain with the help of your knowledge in gases.
- What is the partial pressure of gas?
- What is the law of partial pressures?
- What mathematical formulas are associated with the law of partial pressures?

### Part 4

- When diving on air, how do you calculate the partial pressure of nitrogen in a given depth?
- How do you calculate the maximum percentage of dioxygen to be used in a nitrox mixture?
- Why is the max depth of a dive in the air established at 60 m?
- If a person inhales pure dioxygen at sea level, will it exceed the threshold of toxicity of dioxygen? Explain.
- How do you determine the number of decompression level needed while going back up the surface?
- How do you calculate the time needed to reach a maximum depth?
- How do you calculate the duration of a dive, up to the moment where the diver decides to resurface?
- What formula allows you to calculate the quantity of air needed to dive at a given depth?

### Part 6

Explanations:

- with the use of a graph, represent the expedition that was planned. Don’t forget to use the levels of decompression.
- Calculate the quantity of air containers needed for a safe expedition.
- Do you recommend the use of enriched dioxygen? If yes, what is the maximum percentage of dioxygen should the enriched air contain?

Validation/Justification

- What are the advantages of your plan? Explain your answer.
- What are the disadvantages of your plan? explain your answer 3. Justify your recommendtion regarding the use of enriched air.
- What chemical laws and principles should we use in planning an underwater diving? Explain.
- What improvements can you give to the plan of this underwater diving expedition?