防曬劑的原理 - 保養
By Thomas
at 2014-06-01T14:12
at 2014-06-01T14:12
Table of Contents
一直有一個疑惑,
就是防曬劑的功用,是根據時間還是曝曬程度遞減呢?
如果在不流汗出油,防曬劑沒掉的前提下,會是:
1.一定用量的防曬劑吸收定量的紫外線,
例如10元硬幣用量吸收x量紫外線,吸完要再補擦
沒曬到就可以不用補
還是
2.一定用量防曬劑只能在一段時間內起作用,
例如早上8點擦,就算中間沒曬到太陽,
3.4個小時後還是要補?
(不過這個假設有點爭議@@a 因為沒曬到太陽還是會有紫外線)
雖然看了一些有關防曬係數的文章,
但還是一知半解,
請問究竟哪一個認知才是對的呢?謝謝
--
就是防曬劑的功用,是根據時間還是曝曬程度遞減呢?
如果在不流汗出油,防曬劑沒掉的前提下,會是:
1.一定用量的防曬劑吸收定量的紫外線,
例如10元硬幣用量吸收x量紫外線,吸完要再補擦
沒曬到就可以不用補
還是
2.一定用量防曬劑只能在一段時間內起作用,
例如早上8點擦,就算中間沒曬到太陽,
3.4個小時後還是要補?
(不過這個假設有點爭議@@a 因為沒曬到太陽還是會有紫外線)
雖然看了一些有關防曬係數的文章,
但還是一知半解,
請問究竟哪一個認知才是對的呢?謝謝
--
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保養
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at 2014-06-04T20:26
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