Naked Science Forum

Life Sciences => Marine Science => Topic started by: CS_SJ on 20/09/2022 02:43:14

Title: jar of water hypothetical question
Post by: CS_SJ on 20/09/2022 02:43:14

Was wondering if you smart people could solve a question. If a diver went down deep, say, 200 feet, and, while down there, he opens a strong jar and fills it with water to the brim and seals it.

Then, he comes back to the surface and opens it, will the water burst out of the jar because it’s under pressure? Or will it just behave like a normal jar of water?

I should note that in this hypothetical scenario, there was no air bubbles in the jar, nor did the jar compress/expand.

Very interested in anyone has some input….would be greatly appreciated!

- MT

Title: Re: jar of water hypothetical question
Post by: alancalverd on 20/09/2022 10:04:14

Yes, water is compressible but not very much.

It has been a problem when recovering deep demersal species. IIRC the first complete and live coelocanth was something of a surprise as fishermen had been trawling apparently dead ones for many years and believed the species was actually extinct.

Title: Re: jar of water hypothetical question
Post by: paul cotter on 20/09/2022 11:56:00

According to a quick google search the bulk modulus of water is 2.2Gn/m². I don't have the time or motivation to do a calculation for 200ft -0 at the moment. I'm sure some other member will oblige.

Title: Re: jar of water hypothetical question
Post by: Bored chemist on 20/09/2022 13:24:01

It will depend on how strong the glass jar is.