El hielo es agua que se congela en un estado sólido, típicamente formándose a o por debajo de temperaturas de 0 °C, 32 °F o 273.15 K. Ocurre de forma natural en la Tierra, en otros planetas, en objetos de la nube de Oort y como hielo interestelar. Como un sólido inorgánico cristalino de origen natural con una estructura ordenada, el hielo se considera un mineral. Dependiendo de la presencia de impurezas como partículas de suelo o burbujas de aire, puede aparecer transparente o de un color blanco azulado más o menos opaco.
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“The challenge of securing safe and plentiful water for all is one of the most daunting challenges faced by the world today. . . . Too often, where we need water we find guns.”
“[Water] is one of the most investigated of all chemicals, but it is still the least understood ... nothing is as complex in its behaviour.”
“The water of Zamzam is a cure for whatever (ailment) it is taken for.”
“Verily, in the beginning this [world] was water.”
“Counsel in the heart of a man is as deep waters, but the man of discernment is one that will draw it up.”
“Est in aqua dulci non invidiosa voluptas.”
Quotes via Wikiquote (CC BY-SA), each with its original source.
