Energy & Green Tech

Lighting the path to renewable energy

Solar power offers a promising, renewable alternative to fossil fuels. But solar power production is complicated and influenced by ever-changing factors like cloud coverage, the time of day, and even dust particles in the ...

Business

Amazon to invest extra 10 bn euros in Germany

Amazon said Wednesday it will invest an additional 10 billion euros ($10.7 billion) in Germany, most of it in cloud computing, the US tech giant's latest major investment in Europe.

Business

Xerox eyes deal for PC maker HP: reports

Xerox is mulling a takeover deal worth $27 billion for HP Inc., the consumer technology unit created by the split of Silicon Valley-based Hewlett Packard, reports said Wednesday.

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Cloud

A cloud is a visible mass of droplets or frozen crystals suspended in the atmosphere above the surface of the Earth or another planetary body. A cloud is also a visible mass attracted by gravity, such as masses of material in space called interstellar clouds and nebulae. Clouds are studied in the nephology or cloud physics branch of meteorology.

On Earth the condensing substance is typically water vapor, which forms small droplets or ice crystals, typically 0.01 mm in diameter. When surrounded by billions of other droplets or crystals they become visible as clouds. Dense deep clouds exhibit a high reflectance (70% to 95%) throughout the visible range of wavelengths. They thus appear white, at least from the top. Cloud droplets tend to scatter light efficiently, so that the intensity of the solar radiation decreases with depth into the gases, hence the gray or even sometimes dark appearance at the base. Thin clouds may appear to have acquired the color of their environment or background and clouds illuminated by non-white light, such as during sunrise or sunset, may appear colored accordingly. In the near-infrared range, clouds look darker because the water that constitutes the cloud droplets strongly absorbs solar radiation at those wavelengths.

This text uses material from Wikipedia, licensed under CC BY-SA