Why do our clothes appear darker when they get wet?

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  Why do our clothes appear darker when they get wet? Hi guys, I hope you all will be fine and enjoying. Today in this post we are going to know why do our clothes appear darker when they get wet. So, Let's start.... Any cloth is made from a yarn or fibre. That fibre in turn made of smaller micro-fibre. Some of the photons of light are absorbed but some are reflected and land on our retina and that gives us the sensation of seeing the cloth as having a certain level of brightness.  But when the cloth gets wet the water fills in the gaps between each individual microfiber or yarn. When light falls on the wet cloth, some of it is now more likely to enter the water and be bent away from our eyes. So, some of the light that would have previously been reflected off the cloth back to our eyes is now bent away. Fewer photons of light get back to our eyeball and so the wet cloth appears darker than the dry cloth. But as the water gradually evaporated more and more light is reflected b...
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The Science Behind 3-D Printing.

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 The Science Behind 3-D Printing.

Hi guys,

I hope you all will be fine and enjoying.Today in this post we are going to explore the science behind 3-D printing.

So,Let's start...

The technology that makes 3-D printing possible has roots in experiments that led to the development of photography 200 years ago. Scientists realized that certain materials would undergo chemical changes when exposed to light.

One common method of 3-D printing called stereo lithography was first developed in the 1980s.It creates objects by exposing light-sensitive polymers, called photopolymers, to ultraviolet rays from a laser. Photopolymers start as a combination of several substances: a large molecule that may be an acrylic or a form of plastic; a small molecule to keep the mixture in an initial liquid state; and a photoinitiator that, when exposed to light of the right wavelength, cause the other two substances to bind into a solid form.

A vat of this substance is placed on a movable tray inside a printer, and then a computer-guided UV laser traces thin layers of the substance. The tray then shifts down to allow for a second layer of photopolymer. This process is repeated until the full object taken form.

Watch the video to know more about 3-D printer.

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