Citação :

A água das chuvas faz o mesmo efeito.

partindo do principio que os ceus sao "limpos" sim mas como nao sao ^^

Não é bem...mas anda lá perto.
Lê isto,não encontrei em português...

No. By definition distilled water is a molecule consisting of two atoms of hydrogen and on atom of oxygen or H2O [imagine that was a small 2] and nothing else. Rain occurs when water vapor in the air of a system, as that system approaches the dew point, condenses into liquid water. Water condenses where it does because of a dust mote or other particle in the air gave it something to latch onto and accumulate--so there is always some impurity in a droplet of rain water.
Only in a perfectly sterile system, as in a lab apparatus, can one cause water molecules to condense in a pure or distilled form.

esta confesso que não sabia...
Bit of trivia, perfectly distilled water in a perfectly sterile container does NOT conduct electricity. The impurities in the water provide the valence electrons through which the current flows.