Quiz - Physics - Volume at Depth

[Pedro Burrito]

The time is 02:20 and I'm still awake so I'm posting the quiz for Friday.

From the Physics Section of the PADI Dive Theory Exam:

At 30m/99ft of salt water a flexible container is filled to only 25% of its capacity. If this container is taken to 10m/33ft, what will happen to the air volume inside?

a. The volume will be the same at both depths.

b. The air volume will increase by 33%.

c. The air volume will double.

d. The air volume will decrease by 3/4.


I will post a daily question from my exams to help newer divers and to encourage more experienced divers to interact gracefully and helpfully with the newer divers.

Reminder - this is a post in the Basic Forum and it is a green zone. Please be nice and on topic.

Thank you for your patience while we try to give people something to discuss other than Covid-19 and/or Politics. I will post the answer covered by the spoiler tag later today.

 

[-JD-]

Ok, I had my beer. I'll be "flexible" (actually it is a reasonably sufficient description for this scenario)

Thank you, Pedro!

 

[Brett Hatch]

Good question

 

[jonhall]

My answer is the same as for how confident I feel about today's question! Thanks for the questions.

 

[broncobowsher]

It will explode. I don't see that as one of the voting options. But it is my choice.

 

[Pedro Burrito]

Spoiler: Answer

c. The air volume will double.

 

[rhwestfall]

 

[tursiops]

One way to do this kind of problem is to break it into two parts: first take the object to the surface, then as a new problem take that volume back down to the final depth.

 

[TMHeimer]

One way to do this kind of problem is to break it into two parts: first take the object to the surface, then as a new problem take that volume back down to the final depth.

Am I correct in this is what you must do if it's to be a depth that is not exactly 2 ata or 4 ata, etc.--like "what will the volume be at 46 fsw"? I suppose if you were a genius with numbers you may do it in your head.

 

[tursiops]

Am I correct in this is what you must do if it's to be a depth that is not exactly 2 ata or 4 ata, etc.--like "what will the volume be at 46 fsw"? I suppose if you were a genius with numbers you may do it in your head.

Yes, it makes it a lot easier, less prone to errors (of either logic or math).