vees lahustunud mineraalsoolade hulk promillides või grammides kilogrammi vee kohta (soolsust kindlaks määrates arvutatakse halogeenide looduslikud ühendid halogeniidid ümber kloriidideks ja karbonaadid oksiidideks)
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Soolsuse järgi eristatakse hüperhaliinset (üle 40‰), euhaliinset (30–40‰), miksohaliinset (0,5–30‰) ja magevett (alla 0,5‰).
a measure of the concentration of dissolved salts (sulphates and chlorides of sodium and calcium) in water, normally expressed as parts per thousand (‰)
Soolsust mõjutavad sademed, aurumine, vee ringlemine ja juurdevool jõgedest. Avaookeanis on soolsus peaaegu ühesugune (harilikult 34,5–35,5‰), ääre- ja sisemeredes väga erinev: 1–2‰ (Läänemere idaosas), 18‰ (Mustas meres) ja 38–42‰ (Punases meres). Mõne soolajärve (näiteks Surnumere) soolsus küünib isegi 200–300‰-ni.
Freshwater has a salinity of less than 0.5‰ (it is described as limnetic), seawater has a salinity greater than 30‰ (it is euhaline), and brackish water an intermediate salinity.
‘Saltwater’ means water where the salinity is appreciable. This may be water where the salinity is constantly high (e.g. seawater) or where the salinity is appreciable but not at a constantly high level (e.g. brackish water): the salinity may be subject to periodic variation due to the influx of fresh or seawaters.
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