The importance of material properties

Whenever you plan to build something, you need to choose not only which material to use, but how to assemble them. Material properties is obviously an important issue in any build, but how do you choose how to connect the materials in order to make the strongest structure with the least amount? The Royal Institution may have the beginning of the answer in this highly educational video. Here they let children experiment with such unusual building materials as spaghetti and marshmallows to learn what forms are stable, and which are not. Although it might be seen as a childish game, we strongly recommend that you try this experiment yourself, even if you are a senior citizen! These experiment will give you a whole new appreciation of the complexity of structure, and how geometry can be the difference between a successful invention, and a failed one.

How to make a glowing goo (non Newtonian liquid)

#craftersu #diy #Physics

This is a tutorial for all you physics nerds out there. Have you heard about “non Newtonian liquid”? It is a really weird liquid that turns into a solid when hit with sudden impact. You can juggle it like balls, but as soon as you stop moving, this material turns into a fluid and runs right through your fingers. Used for such high-tech applications as bulletproofing, shock absorbing, motorcycle protection and much more, the area of non Newtonian liquid is open for new applications and innovations. Some have even used it to fill big containers and been able to run across it! What great new invention could you make with this stuff? In this video by Grant Thompson you can learn how to make this magical goo, and even make it glow under UV light with the use of common household items. And its safe to eat even! Probably doesn’t taste very good though 😛

Tin pest (Catastrophic collapse at lower temperature)

In this video, Dr. Ainissa Ramirez from Yale University talks about how tin objects can be completely destroyed by simply getting to cold. Temperature can have a serious impact on materials properties in general, but this is an extreme case. When pure tin gets to cold, it seems to destroy itself and leave a pile of gray dust behind. This phenomenon is called “Tin pest” and was a serious problem back in the day when many objects was made from it. But we also use a lot of tin in today’s products, all electronics are soldered using a metals containing tin for example. Now days the tin is mixed with other metals in order to avoid this problem, but it’s not foolproof. So if you want to make something out of tin, make sure it can stand the temperature.

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How temperature can have drastic effect on material properties

When you need to choose a material, it is essential to keep in mind the environment in which the material is going to be used. Such a seemingly small matter as temperature can cause a complete breakdown of parts, if they are made from the wrong materials. On the other hand, you will rarely find a material that has perfect properties. In the end you will need to know enough about material properties to choose which material will suit your purpose best. Here, Dr. Ainissa Ramirez from Yale University demonstrates how temperature can change the ductility of materials like rubber and steel with catastrophic results.