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More versatile than standard patio umbrellas, ... The Best Cantilever Umbrellas. Best Overall: Grand Patio Napoli Sunbrella Cantilever Umbrella. ... provides UV protection, and doesn’t fade ...
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The umbrella — which has a 4.5-star average rating from over 300 reviews on Amazon — comes in a dozen different colors, including purple, orange, red and green.
A relatively new rating designation for sun protective textiles and clothing is UPF (ultraviolet protection factor), which represents the ratio of sunburn-causing UV measured without and with the protection of the fabric. For example, a fabric rated UPF 30 means that, if 30 units of UV fall on the fabric, only 1 unit will pass through to the skin.
The UV index is a number linearly related to the intensity of sunburn-producing UV radiation at a given point on the Earth's surface. It cannot be simply related to the irradiance (measured in W / m 2 ) because the UV of greatest concern occupies a spectrum of wavelengths from 295 to 325 nm, and shorter wavelengths have already been absorbed a ...
Parts of an umbrella [2]. The word parasol is a combination of the Latin parare, and sol, meaning 'sun'. [3] Parapluie (French) similarly consists of para combined with pluie, which means 'rain' (which in turn derives from pluvia, the Latin word for rain); the usage of this word was prevalent in the nineteenth century.
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