The steam warmes superficial tanks and gives origin to the sources of thermo-mineral water. These are called so because they become rich in mineral contained into the grounds before going out to the surface. This is the reason of the different chemical composition of thermal waters because the chemical composition of the grounds is different.

Here we can find a classification tableof waters present in the island:

sodic-chloride waters	salt-sosphat-alkaline waters salt-sosphat -alkaline-earthy waters salt-jodic waters	77 appearing (Ischia porto, Lacco Ameno, Casamicciola)
bicarbonate-alcaline waters	bicarbonate-sosphat waters bicarbonate-sosphat -alkaline waters bicarbonate-sosphat -alkaline-earthy waters	20 appearing (Casamicciola, Barano)

The temperature of mineral waters changes between 15C° and 86C° (so they are: cold, ipothermal, thermal, iperthermal). The sources of the island register the concentration of small quantity of a noble gas: Radon. This presence is not harmful because the gas has a reduced power of penetration (a sheet of paper is enough to stop it), it has a reduced period of life so it isn't able to accumulate itself). It is demonstred it has a good influence on human health exalting its phisyological functions so it can be exploited in various clinical situations.

The thermalism

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