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| Water Treatment | Purification of water to make it suitable for drinking or for any other use. |
| Charcoal | A drawing pencil or crayon made from this material. |
| Solar Power System | The conversion of the energy of the sun's radiation to useful work. |
| solar cell | A semiconductor device that converts the energy of sunlight into electric energy. Also called photovoltaic cell. |
| Enamel | A vitreous, usually opaque, protective or decorative coating baked on metal, glass, or ceramic ware. |
