chris b Posted June 3, 2013 Report Share Posted June 3, 2013 My brother and i have had a discussion he thinks if I had a fish tank full of water and 1 fish the water level would drop because the fish would drink or absorbs the water turning the water into energy and energy evaporating thus dropping the water level. I thought the fish in the tank would absorb the water using it in its system and pissing it back into the tank and the water level would never change not including evaporation. Can anyone tell me if either of us is correct? Quote Link to comment Share on other sites More sharing options...
SamH Posted June 3, 2013 Report Share Posted June 3, 2013 Is the theoretical system closed? Nothing in or out except the fish? Quote Link to comment Share on other sites More sharing options...
calculator Posted June 3, 2013 Report Share Posted June 3, 2013 the water level would drop because the fish would drink or absorbs the water turning the water into energy and energy evaporating thus dropping the water level. I thought the fish in the tank would absorb the water using it in its system and pissing it back into the tank and the water level would never change not including evaporation. Can anyone tell me if either of us is correct? You are correct. The water the the fish absorbs stays as water and doesnt change. Quote Link to comment Share on other sites More sharing options...
chris b Posted June 3, 2013 Author Report Share Posted June 3, 2013 You are correct. The water the the fish absorbs stays as water and doesnt change. Quote Link to comment Share on other sites More sharing options...
smidey Posted June 3, 2013 Report Share Posted June 3, 2013 wouldn't the water level rise? the fish would absorb and drink some of the water but the solid parts of the fish will displace some volume. So if your tank was full and you added a fish it would over flow. Edit. I should have read the question properly haha Quote Link to comment Share on other sites More sharing options...
calculator Posted June 3, 2013 Report Share Posted June 3, 2013 You are correct. The water the the fish absorbs stays as water and doesnt change. so the water doesn't get changed into energy? it stays as water threw the fishes system and when it urinates it will eventually pass all the water it absorbed every last drip? sorry if i'm going over the same thing again just trying to understand it correctly Quote Link to comment Share on other sites More sharing options...
Phantom Posted June 3, 2013 Report Share Posted June 3, 2013 Mass can't change into energy. Stored energy in an animal is fat, but it's still mass. You can take the energy in something and put that energy into something else, but since you've got a closed system, there is no where else for it to go. Quote Link to comment Share on other sites More sharing options...
chris b Posted June 3, 2013 Author Report Share Posted June 3, 2013 thanks team i think i understand now much appreciated cheers chris Quote Link to comment Share on other sites More sharing options...
chris b Posted June 3, 2013 Author Report Share Posted June 3, 2013 wouldn't the water level rise? the fish would absorb and drink some of the water but the solid parts of the fish will displace some volume. So if your tank was full and you added a fish it would over flow. Your looking at it different to what i'm trying to figger out. "So if your tank was full and you added a fish it would over flow" yes but not what i'm getting at sorry Quote Link to comment Share on other sites More sharing options...
smidey Posted June 3, 2013 Report Share Posted June 3, 2013 Your looking at it different to what i'm trying to figger out. "So if your tank was full and you added a fish it would over flow" yes but not what i'm getting at sorry Yeah didn't read it properly Quote Link to comment Share on other sites More sharing options...
Ira Posted June 3, 2013 Report Share Posted June 3, 2013 You are correct. The water the the fish absorbs stays as water and doesnt change. so the water doesn't get changed into energy? it stays as water threw the fishes system and when it urinates it will eventually pass all the water it absorbed every last drip? sorry if i'm going over the same thing again just trying to understand it correctly No, it doesn't get changed into energy. Biologically the water isn't an energy source it's more of a solvent or carrier for nutrients. Bit more complicated when you add in osmotic pressures, etc but that's another matter. Quote Link to comment Share on other sites More sharing options...
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