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       #Post#: 2--------------------------------------------------
       Why are some materials clear and others opaque?
       By: Hani Smaik Date: July 27, 2019, 6:12 pm
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       Sometimes being clear is defined as a quality or purity. Other
       times, we need to make a substance clear such as glass or
       varnish. Knowing why and in what condition the material s are
       clear in can help us achieve the ability of converting opaque
       materials to clear materials or vice versa if needed. We all
       have seen glasses, plastic, soap, shampoo, all kinds of food, in
       clear and not clear conditions. Now we need to find out how
       being clear or opaque is an optical property of a substance.
       Please share your findings in this regards.
       Thanks
       [attachimg=1]
       #Post#: 4--------------------------------------------------
       Re: Why are some materials clear and others opaque?
       By: Hani Smaik Date: July 27, 2019, 8:54 pm
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       Consider the following experiment:
       For our first test, you will need either salt or sugar crystals.
       Take one grain of either the salt or sugar, and look at it. As
       you can see, it is clear and that you can see right through it.
       Now, take a spoon full of salt or sugar and put it on the same
       surface. As you can see, it is opaque this time and is not
       clear, yet it is the same clear grains of crystal. This shows
       that crystals are only clear if they are in one piece. That
       means that if you break up that one piece into twenty pieces
       piled up on top of each other, they will no longer be clear. In
       the next experiment, take a clear crystal and crush it fully.
       When you are done crushing it, you will notice that it is a
       white unclear powder. Even though every single piece of this
       powder under a microscope is clear, the powder that is a group
       of clear components is not clear. Next, dissolve the white
       powder in water. The crystals become clear again. It stays clear
       until the water evaporates and it becomes crystal again. For our
       final and last experiment, you will need an ice cube. Take the
       ice cube and look at it. It is clear for the most part. Now
       crush the ice and you will notice that it is no longer clear but
       is opaque.
       So why is it that when we look at sugar or salt we see it white?
       What does that have to do with transparent soap?
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