Encyclopedia > Silica gel

  Article Content

Silica gel

Silica gel is a granular, porous form of silica made synthetically from sodium silicate[?]. It was invented at the Johns Hopkins University, Baltimore, Maryland in the 1920s. Its high porosity, around 800 m²/g, allows it to adsorb water readily, making it useful as a desiccant[?] (drying agent). It can reduce the relative humidity in a closed space to around 40%. Once saturated with water, the gel can be regenerated (dried) by heating it to 150°C (300°F). The gel is non-toxic, non-flammable and chemically highly inert. It is sometimes supplied mixed with a moisture indicator, which is a chemical that changes colour when damp.

All Wikipedia text is available under the terms of the GNU Free Documentation License

  Search Encyclopedia

Search over one million articles, find something about almost anything!
  Featured Article
Canadian Charter of Rights and Freedoms

... in the European Convention. This general limitations clause definitely makes the Canadian Charter distinct from its American counterpart. Additional Features of the ...

This page was created in 27.3 ms