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Humidification is a process by which a current of unsaturated air comes into contact with water and cools it. It cools down because the air drags with it part of the water which evaporates, subtracting heat from the water in the form of latent heat or evaporation. Overly dry rooms are unhealthy, especially for newborns, for the elderly or for people with breathing problems. It is therefore very important to adjust the indoor level of humidity to keep airways moist. A humidifier is very useful for preventing lung diseases or disorders; symptoms such as irritation or inflammation of the respiratory tract should never be neglected. Winter is the season during which its use is most beneficial, because radiators and their high temperature makes the air very dry and room temperature non uniform.
Their use is very simple: just fill the tank with spring water, plug in the appliance and use the controls to set the desired humidity level. The most advanced models, such as ACQUASPA, also feature a WARM STEAM function that vaporizes warm steam to reduce bacterial levels in the air.

Absolute air humidity is a function of temperature. The higher the temperature, the greater the quantity of water steam needed to condense into microscopic water droplets (100%).  That is why relative humidity needs to be taken into consideration (humidity/temperature ratio). Ideal relative humidity is between 40% and 55% (depending on the season): under this level, mucous membranes become dry and sweat dry too quickly (dehydration), above this level, sweat will not evaporate, mould and fungi form easily and a