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Sunscreens work by absorbing, reflecting or scattering ultraviolet light, thereby reducing the amount that reaches the skin. The sun protection factor (SPF) of a sunscreen tells you how much longer you can stay in the sun without burning if you apply the sunscreen. For example, if your child would burn after 20 minutes of sun exposure, applying a sunscreen with a SPF of 15 gives her 15 times the protection. In this example, the child will be protected for up to 5 hours: 20 minutes x 15 SPF = 300 minutes (5 hours).
The FDA recommends that kids use a SPF of 15 or higher to prevent both sunburn and tanning. A SPF of 15 will block about 94 percent of UVB rays and a SPF of 30 will block about 97 percent of UVB. But keep in mind that these SPF ratings do not necessarily mean your child will be protected against the UVA rays that cause cancer and skin damage. SPFs only give a rating of sunburn protection. Your sunscreen should include ingredients that protect against both UVA and UVB rays.
Wiki User
∙ 14y ago
Wiki User
∙ 11y agoAccording to chemistry.about.com: "Sunscreen combines organic and inorganic chemicals to filter the light from the sun so that less of it reaches the deeper layers of your skin. Like a screen door, some light penetrates, but not as much as if the door wasn't present. Sunblock, on the other hand, reflects or scatters the light away so that it doesn't reach the skin at all."
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Which sunscreen works best spray or rub-on?
the spray sunscreen works better on U.V. beads but I don't know on human skin.
Can you explain how sunscreen works in simple words?
Contains small particles that sunlight refracts off.
Do perfumes have sunscreen?
No, perfumes do not have sunscreen.
Which sunscreen stays for a longer period?
working sunscreen
How can a vampire become immune to the sun?
Sunscreen. Lots of sunscreen.
When was Wear Sunscreen created?
Wear Sunscreen was created in 1998.
Why use natural sunscreen on your body rather than regular sunscreen?
Well, natural sunscreen has many useful benefits that normal sunscreen does not have. A natural sunscreen for example can provide much vitamins and mineral that are beneficial for your skin in many ways. The regular sunscreen on the other hand can contain many ineffective chemicals and is not as effective as a natural sunscreen. http://www.kitchenstewardship.com/2010/07/20/natural-sunscreen-review-do-mineral-based-sunblocks-work-2/
When exercising outside how much sunscreen do you need to apply?
A lot of sunscreen
Is sunscreen a pure substance or a mixture?
Yes, EXTRASHADE sunscreen is very helpful for men, women. It protects your beautiful Rich complexions from the harmful UV rays of the sun.
What is a simile i can make with the word sunscreen?
A doze of sunscreen might work...
What does the abbreviation SPF stand for?
Assuming the question is asking about sunscreen SPF, it stands for sun protection factor. This is put on sunscreen bottles to show the consumer how strong the sunscreen is.
Does Clinique foundation contain a sunscreen?
Clinique foundation actually can contain or not contain sunscreen based on your preference. The options that do contain sunscreen contain 15 and up spf.
