Re: How can I find out how much salt is in ocean water?

Assuming that these vials contain seawater it is quite easy to figure out the quantity of salt. All you need is to know the volume of water in the vial. The amount of salt in seawater is described by a quantity called salinity and is measured in parts per thousand (designated by the symbol ‰). Convieniently, this is a MASS ratio. This means that each [kg] (which is 1 litre) of seawater contains approximately 34.73 [g] of salt (yes, that is a lot of salt!). Of course this amount is an average. The actual salinity is variable depending on the latitude, and this relationship isn't true in estuaries (where saltwater is mixed with freshwater from a river).

Planktonman