Sun Protection Factor

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SPF stands for Sun Protection Factor. Moreover its, number is determined experimentally indoors by exposing human subjects to a light spectrum meant to mimic noontime sun. Some subjects wear sunscreen and others do not. The amount of light that induces redness in sunscreen-protected skin, divided by the amount of light that induces redness in unprotected skin is the SPF. It is mainly a measure of UVB protection and ranges from 1 to 45 or above.

A sunscreen with an SPF of 15 filters 92% of the UVB. Put another way, a sunscreen with an SPF of 15 will delay the onset of a sun burn in a person who would otherwise burn in 10 minutes to burn in 150 minutes. The SPF 15 sunscreen allows a person to stay out in the sun 15 times longer.

There is currently no uniform measure of UVA absorption. There are broad-spectrum sunscreens that protect against UVA and UVB radiation although it is important to remember that the SPF does not predict UVA protection. The UV Index is a public health education tool reported by meteorologists in 58 U.S. cities. It offers a daily report of UV light levels on a scale from 1-10+. The "protectiveness" ...
... of clothing can also be measured by SPF.

The following are SPF's of various types of clothing: Nylon Stockings - SPF 2 Hats - SPF 3-6 Summer-weight clothing - SPF 6.5 Sun-protective clothing - up to SPF 30

A bump, a rash, a dry patch -- skin, as well as hair and nail conditions, can be perplexing. Some can be harmless (though nevertheless annoying), yet others can be warning signs of more serious medical concerns. Here, a round-up of skin conditions and symptoms from A to Z to help you decode your rash with in-depth focus on several common conditions. From the advice of a friend to buzz in the media, it's hard to determine what's legitimate and what's hype when it comes to treatments for various skin, hair and nail conditions.

We are learning more and more about the best ways to treat atopic dermatitis - the most common form of eczema. Atopic dermatitis is never cured, but it can be managed. The sun's light breathes life into the earth, but it also can be damaging in heavy doses. Beyond cloud cover, humans use various implements like sunglasses, sunscreen and window tinting to filter out harmful ultraviolet rays. A range of science experiments can illustrate or compare these various methods in straightforward yet illuminating formats.

Sunscreen Comparison Experiment Use color-changing UV beads, available at hobby, craft and science stores, to compare different strengths of sunscreen. Place several beads inside different plastic baggies, then coat the outside of each with a different SPF strength of sunscreen. Leave one uncoated as the control. Place the bags in direct sunlight and watch in minutes how the colors will turn more vibrantly to primary colors as the level of SPF decreases to the bag with none, which should contain--after five or 10 minutes--the most dramatically colored beads.

This article has been written and posted by a health advisor working at bookmydoctor.com, who also provides free of cost consultancy to patients and advise to search and find, Skin Specialist in Gurgaon By visiting the site, patients can look for Hair Specialist in Gurgaon and to get the proper treatment of their disease. Here patients can also know Sun Protection Factor.

This article has been written and posted by a health advisor working at bookmydoctor.com, who also provides free of cost consultancy to patients and advise to search and find, Skin Specialist in Gurgaon By visiting the site, patients can look for Hair Specialist in Gurgaon and to get the proper treatment of their disease. Here patients can also know Sun Protection Factor.