how much does a cubic metre of sea water weigh?

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1.025 g/ml at the surface

so 1.025 kg/ L

1.025*1000 = 1025 kg/ m^3

it varies depending on its temperature and salinity though.

It all depends on the salinity of the water, different seas have more salt in them than others eg. The Dead Sea would obviously weigh more than the Atlantic Ocean

The density of sea water at the sea surface is about 1027 kg/m3

So the weight = 1027 kg

1025kg roughly and it doesn't depend on whether there are any fish swimiing in it. Fish adjust their density, using swim bladders, so they are neutrally bouyant. A neutrally bouyant object displaces its own weight of water so the fish weighs just the same as the water it has replaced. No noticeable difference.

Average density of seawater is1025kg/m^3,but that depends on the salinity, which varies in different areas of the world.

So it weighs 1025kg

About 1020 to 1035 kilograms, depending on temperature and salinity.

At 4 degrees Centigrade 1 cubic centimetre of distilled water weighs exactly 1 gram. So work it out.

it depends

if it was absolutely clear it would be about 1.025 g/ml

if it was salt water about double that

it also depends on temperature as cold weather is heavier than warm water

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