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UPF (ultraviolet protection factor) represents the ratio of sunburn-causing UV without and with the protection of the fabric, similar to SPF (sun protection factor) ratings for sunscreen. While standard summer fabrics have UPF ~6, sun protective clothing typically has UPF ~30, which means that only 1 out of ~30 units of UV will pass through (~3%).
The sun protection factor (SPF rating, introduced in 1974) is a measure of the fraction of sunburn-producing UV rays that reach the skin. For example, "SPF 15" means that 1 ⁄ 15 of the burning radiation will reach the skin, assuming sunscreen is applied evenly at a thick dosage of 2 milligrams per square centimeter [ 68 ] (mg/cm 2 ).
The ultraviolet index, or UV index, is an international standard measurement of the strength of the sunburn -producing ultraviolet (UV) radiation at a particular place and time. It is primarily used in daily and hourly forecasts aimed at the general public. The UV index is designed as an open-ended linear scale, directly proportional to the ...
Automotive safety. Crash testing is one of the components of automotive safety. Automotive safety is the study and practice of automotive design, construction, equipment and regulation to minimize the occurrence and consequences of traffic collisions involving motor vehicles. Road traffic safety more broadly includes roadway design.
Because of the inconsistencies with the various definitions of production cars, dubious claims by manufacturers and self-interested groups, and inconsistent or changing application of the definitions, this list has a defined set of requirements. For further explanation of how these were arrived at see the links above.
When I commuted by car every day, I always wanted to build an LED display that would communicate my displeasure with my fellow motorists. My lack of engineering know-how put paid to the idea, but ...
Without any protection, the sun can heat up a car's dark dashboards to 69 °C (156 °F) within 60 minutes. This is dangerous for adults, children, and animals. Prolonged exposure to direct sunlight can also make the dashboard fade and eventually crack, or cause damage to items left in the car, such as mobile phones, laptops and other electronic ...
The Model 3 is not the only vehicle to earn a 5-star rating from Euro NCAP. The Audi e-tron, Toyota Corolla, Volkswagen T-Cross, Mazda 3, Kia Ceed and Lexus UX are some of the other 2019 models ...
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