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More recently, some solar power towers use liquid sodium, which has a higher heat capacity and retains heat for a longer period of time. Solar power towers use heliostats, flat mirrors that turn to follow the sun’s arc through the sky. The mirrors are arranged around a central "collector tower," and reflect sunlight into a concentrated ray of light that shines on a focal point on the tower. Fresnel reflectors use flat, thin strips of mirror to capture sunlight and direct it onto a tube of liquid. Use a 1M to 10M ohm 1W or greater wattage resistor on the end of an insulating stick or the probe of a high voltage meter. Many factors contribute to this: Cities are constructed of materials such as asphalt and concrete that absorb heat; tall buildings block wind and its cooling effects; and high amounts of waste heat is generated by industry, traffic, and high populations.
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