Water is a universal solvent which has an effect on building defects/dampness due to salt movement. 

Different materials in a building can absorb water at high humidity and release it at times of low humidity. The amount of hygroscopic moisture which a material can hold is variable, but salts increase moisture retention.  It is why building professionals discuss the ability of a buildings ability to buffer moisture.

It is unique as in the earth’s climate; as it occurs in three forms: 

1. Vapour.

2. Liquid.

3. Solid (ice, snow).

H2o is the name given to a water molecule, which is only 0.275 nanometres in size, and billions of them are need to create a droplet.