Ví dụ về việc sử dụng An spf trong Tiếng anh và bản dịch của chúng sang Tiếng việt
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 clothing also has an spf.
It is logical for someone to think that an SPF of 30 is twice as good as an SPF of 15 and so on.
Choose a sunscreen that blocks both UVA and UVB types of radiation from the sun andhas an SPF of at least 15.
If 100 photons were to contact skin, an SPF 15 sunscreen will offer protection from 93 percent of those photons;
One way of looking at this is that SPF 30 suncream only gives you 4% more protection than an SPF 15 sun cream.
That's the equivalent of an SPF 3, so use it to bolster(not replace) your daily dose of sunscreen.
Your skin is your first line of defense against the sun,so it's essential to protect it with an SPF cream.".
Using a sunscreen with an SPF of at least 15 every day will help protect you from this type of quick, daily exposure.
Email providers such as Gmail canalso skip marking any messages as spam, even if an SPF system softfail was used.
According to the team, using sunscreen with an SPF of 15 or higher can reduce the body's vitamin D-3 production by 99 percent.
An SPF of 30 to 50 works well for everyday use, but Huang suggested an SPF of 50+ when you plan on being outside for a long time.
Before you go outside, apply a moisturizing,broad-spectrum sunscreen with an SPF of fifteen or higher to all exposed areas of your body.
For example, when applying an SPF 30 sunscreen correctly, you get the equivalent of 1 minute of UVB rays for each 30 minutes you spend in the sun.
The United States Food& Drug Administration(FDA)recommend regularly applying a sunscreen with an SPF of 15 or higher, even on cloudy days.
For example, an SPF of 30 means that you can spend 30 times as long in the sun before burning compared to not wearing any sunscreen at all.
It has been proven that thedaily use of a skin care product with an SPF of 16 results in up to 40 percent fewer squamous cell carcinoma lesions of the skin.
If your make-up foundation has an SPF of 10 and your powder has an SPF of 8, the maximum protection you are getting is 10, not 18.
While outdoors, liberally apply a broad spectrum sunscreen with an SPF of 30 or higher(don't forget the lips and ears!), wear a hat and sunglasses, and cover up with clothing.
So, if you would usuallybegin to burn after 5 minutes in the sun, an SPF of 30 would theoretically allow you to spend time outside for 150 minutes(30 x 5) before you burn.
Nothing blocks 100% of UVB rays, and a sunscreen that touts an SPF 100 rating, which sounds impressive, will actually only block 1% more UVB rays than an SPF 50 sunscreen.
Start with a spf.
Select a broad-spectrum sunscreen with a SPF of 30 or larger- and keep in mind that it needs to be reapplied each 2 hours.
Choose a broad-spectrum sunscreen with a SPF of 30 or greater- and remember that it needs to be reapplied every 2 hours.
Therefore, when going out,be very careful so that the lip balm you choose contains a SPF of at least 15.
This recipe contains zinc oxide at 10% which gives it a SPF of around 6-11.
In this case,a 1.7 percent change in light transmission yields a SPF measurement of 37 instead of 100.
To protect your lips, apply a lip balm with a SPF of at least 15.
The efficacy of the sunscreen tapers off around SPF 50,so it is not necessary to apply sunscreen with a SPF higher than 50.
Lipstick forms a protective barrier from the sun's rays as it contains a SPF, usually SPF 12 or higher.