Density of Sea Water [duplicate]

Understandably, there is a clear-cut difference between liquids and gasses. Gasses being more compressible, liquids less so. If you bring a volume of air sealed in a container from sea level to 10k feet (3048m), when you open the container, the relative volume around the container has decreased considerably and upon opening the container, it lets out a discernible sound. Clearly, there is a volume difference as less pressure allows the air/gasses to expand. What if you were to bring up, say, 100ml of water from a depth of 11,000m, would it be the same volume if you brought that same sealed sample to sea level and opened the seal? Knowing that you can't pressurize liquids as you can gasses, I'm simply curious: how much would a liquid expand if brought up from the deepest part of the ocean?

• Can you explain what you mean by "relative volume"? – probably_someone Dec 6 '18 at 11:41
• the relative volume meaning that if a 100ml sealed bag of air were taken to altitude, it would expand due to the lack of external pressure, therefore giving it an apparently larger 'volume': relative volume. – Corey Dec 6 '18 at 12:08
• Also, from Wikipedia (en.wikipedia.org/wiki/Properties_of_water#Compressibility): "The low compressibility of water means that even in the deep oceans at 4 km depth, where pressures are 40 MPa, there is only a 1.8% decrease in volume." – probably_someone Dec 6 '18 at 12:08
• So does "relative volume" apply to a fluid inside an expandable, sealed container, or does it refer to the behavior of the fluid after a non-expandable, sealed container has been opened? Your comment and your question say different things on this point. – probably_someone Dec 6 '18 at 12:11
• well actually i'm kind of wondering both- a depth-sealed container's behavior at the surface (prior to opening, like a ziplock bag full of pressurized water), and also a depth-sealed volume's expansion at the surface (after opening). my apologies, I'm trying to explain a thought I have little knowledge of in my head, but a big question about hah – Corey Dec 6 '18 at 12:17