SUBSIM Radio Room Forums - View Single Post - Advices: If you have to dive your boat to ocean floor

Catfish · 04-25-06, 03:21 PM

Hello,
but wasn't that the episode where the microphone fuses had all been flooded with salt water when they removed the panels ? :hmm:
Anyway it was not common to hide in layers of different salinity and density intentionally, but accidentally in a way.

Rosencrantz, if you have a spindle floating in water, and this spindle sinks into the surrounding fluid as deep as to show you something like "1,023" on its scale, you have the salinity and the density of typical sea water at the same time - if the spindle is calibrated at e.g. 20 degrees Celsius it will show the exact density if the water has that temperature. If the water is warmer or colder you still have the density, you only would need to recalculate all if you needed the salinity, and you would do that according to some tables. Colder means the spindle does not sink in so deep, warmer means it will sink in deeper. As well fresh or sweet water will let the spindle sink deeper, and the icy salty waters of the North Atlantic will make it float quite high in the water. The salty waters of the Dead Sea would make it float very high.

So what you always need is the density, since this changes with the temperature and amount of fresh water or better the salt/fresh water ratio, all you need is the spindle to read the density and thus adjust trimming. Don't know if that is understandable, err, a link:

http://www.madsci.org/posts/archives...9315.Ph.r.html

Greetings,
Catfish

04-25-06, 03:21 PM	#19
Catfish Dipped Squirrel Operative Join Date: Sep 2001 Location: ..where the ocean meets the sky Posts: 17,819 Downloads: 38 Uploads: 0	Hello, but wasn't that the episode where the microphone fuses had all been flooded with salt water when they removed the panels ? :hmm: Anyway it was not common to hide in layers of different salinity and density intentionally, but accidentally in a way. Rosencrantz, if you have a spindle floating in water, and this spindle sinks into the surrounding fluid as deep as to show you something like "1,023" on its scale, you have the salinity and the density of typical sea water at the same time - if the spindle is calibrated at e.g. 20 degrees Celsius it will show the exact density if the water has that temperature. If the water is warmer or colder you still have the density, you only would need to recalculate all if you needed the salinity, and you would do that according to some tables. Colder means the spindle does not sink in so deep, warmer means it will sink in deeper. As well fresh or sweet water will let the spindle sink deeper, and the icy salty waters of the North Atlantic will make it float quite high in the water. The salty waters of the Dead Sea would make it float very high. So what you always need is the density, since this changes with the temperature and amount of fresh water or better the salt/fresh water ratio, all you need is the spindle to read the density and thus adjust trimming. Don't know if that is understandable, err, a link: http://www.madsci.org/posts/archives...9315.Ph.r.html Greetings, Catfish