日焼け止めを買う前に！知っておくと便利なSPFとPA
今の季節、日焼け止めを塗るのはお肌を守る常識。でも日焼け止めのパッケージに書いてあるSPFやPAが何を意味するか、知らない人も多いのでは？SPFとPAとは紫外線をブロックする効果を数値に置き換えて表しているものです。知っていると、自分の肌質や状況に合わせて選べますので、覚えておくと便利です。
その前に紫外線は、波長が長い順番にAからCの3種類、UVA、UVB、UVCに分類されます。
Read before you buy a sunscreen! Something to note about SPF and PA.
Now is the season to protect your skin by applying sunscreen. However, how many people are aware of the meanings of labels they see on sunscreen packaging like SPF and PA? SPF and PA numbers indicate the sunscreen's effectiveness against UV rays.
By understanding its meaning, you will be able to select the best sunscreen appropriate for your skin type and situations.
First, it is important to know that UV rays are categorized into 3 types depending on it's wavelength. The types of UV rays from longest to shortest wavelength are UVA, UVB and UVC.
