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    188宝金博页面版: Sunscreen materials - UMassK12

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    内容提示： STEM ED/CHM Nanotechnology 2008 Ultraviolet Sunscreen Protection Activity Introduction It is important to protect our skin from damaging UV radiation, but do we know how well we are protecting ourselves when we wear a lotion that contains a sunscreen? Is wearing a light shirt at the beach as effective as wearing a lotion that contains a sunscreen? Is it better protection? Do thicker, whiter sunscreen lotions protect us better than transparent sprays? Can we tell how well something will block UV b...

    文档格式：DOC | 页数：6 | 浏览次数：34 | 上传日期：2016-03-25 03:58:46 | 文档星级：
    STEM ED/CHM Nanotechnology 2008 Ultraviolet Sunscreen Protection Activity Introduction It is important to protect our skin from damaging UV radiation, but do we know how well we are protecting ourselves when we wear a lotion that contains a sunscreen? Is wearing a light shirt at the beach as effective as wearing a lotion that contains a sunscreen? Is it better protection? Do thicker, whiter sunscreen lotions protect us better than transparent sprays? Can we tell how well something will block UV by looking at its appearance? Research Question In this lab you will be investigating the following research question: Does the opacity of a substance (to visible light) relate to its ability to block UV light? The opacity of a substance is one way to describe its appearance. Opacity is the opposite of how transparent or “see-through” something is; for a completely opaque substance you can not see through it at all. Opacity is a separate property from the color of a substance. For example, you can have something that is yellow and transparent like apple juice or something that is yellow and opaque like cake frosting. Hypothesis Do you think that UV blocking ability relates to a substance’s opacity? Would you expect transparent or opaque substances to be better UV blockers? If you are right, what implications does this have for how you will protect yourself the next time you go to the beach? Write down your best guesses to answer these questions and explain why you think what you think.

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