I went straight to the student mixing after the Young Investigator Award Talks and saw an interesting scene in the mixing. A man was preparing several balloons together with several long and wooden needles. According to the man’s instruction and also to my surprise, these wooden needles were for piercing the balloons. “What the heck is going here?” I said to myself in my mind, “isn’t it crazy?” I went away almost seconds later to get my food. After my food was ready, I felt a strong attraction force from the balloon table. “I must go check it out!” I then walked towards the man.
Daniel Stenberg, a director of Education Outreach from Princeton Center for Complex , is the man who demonstrated this “crazy” piercing game. I asked him what the tricks behind this game and he introduced the mechanism with a friendly smile. Balloons are made of many long strands or chains of molecules that consist the rubber. The trick to pierece the balloon without popping it is to insert the stick through either end of the balloon. Because the rubber at the ends of the balloon is stretched out less than in the middle, the two ends stretch less than in the middle and therefore, less pulling force is there. This particularly low pulling force enables the tip of a stick to break some polymer cross-links without interfering much the overall molecule network. Thus, the balloon can survive after piercing.
During the mixing activity, there is another group from Arizona demonstrating other cool stuffs of material science: the superconductors and the bio-mimic engineering. Pictures below, how popular they were!
Woman Piercing Yellow Balloon On White Background Stock Photo
The MRS Meeting Scene® provides news on scientific presentations and events by on-the-spot reporters at Research Society meetings, workshops, and other special non-MRS conferences. It also provides a snapshot of activities at MRS meetings as contributed by meeting attendees.I was asked to show some science to my daughter’s preschool group and I thought that showing them how you can put a skewer through a balloon without popping it would be fun – and it was!
But how does it work? Why can you put a skewer through a balloon without popping it? Balloons are made from a material (often natural rubber, known as latex) that is able to stretch when a force is applied to it, and then go back to being unstretched when the force is removed. When a balloon is inflated, the balloon is forced to stretch by the pressure of the air inside the balloon. However, and this is the key fact that allows a skewer to go through a balloon without popping it, not all of the balloon stretches. These unstretched areas of the balloon can be pierced with a skewer and the balloon remains intact, just as it would if you were to push a skewer through the rubber of a balloon that had not been inflated.
A simple way to demonstrate this effect is to take a rubber band and stretch it, then cut the band while it is stretched. The rubber band pings back in the direction that it is being pulled. If you take a rubber band and cut it while it is not stretched the rubber band does not ping back.
Needle Thru Balloon Magic Trick
Seems magical doesn’t it? That you can put a skewer through a balloon without popping it. The magic comes, as it often does, because our minds are deceiving us. We think the balloon is completely inflated but, in reality, it is not.
To push a skewer through a balloon without popping it, the skewer must enter and exit the balloon through these two regions. The location of these unstretched areas is very handy. It means a skewer can be “magically” pushed through one end of a balloon and out the other end of the balloon without popping it.
The small dark spot, directly opposite the neck of the balloon, is there as a result of the way balloons are manufactured. This spot is slightly thicker than the rest of the balloon, as such it takes more force to stretch this spot than it takes to stretch the rest of the balloon.
Balloon Skewer: Polymer Science For Kids
The neck doesn’t inflate (stretch) unless the balloon is blown up so much that the pressure of the air inside the balloon starts to inflate the neck of the balloon. Balloons are not usually blown up to this extent as they are much more likely to pop and it also it leaves very little neck to tie a knot in the balloon.
A polymer is a very long molecule. To visualise these polymers and how they make up the material for a balloon, I think a plate of spaghetti is a reasonable comparison. The molecules are lying around randomly, overlapping and squiggly (seems like a good descriptive word). The strands of polymer (spaghetti) are able to be pulled out straighter or made squiggly again – like the stretching and re-forming of the balloon. Strands of spaghetti are separate from each other, whereas the polymers in a balloon are linked together (“crosslinked”) – which helps to hold the balloon together (this crosslinking process is called vulcanization). To help visualise this crosslinking, and to carry on the spaghetti analogy, imagine some spaghetti sauce being added to the spaghetti and mixed in. The strands are now stuck together – but still flexible, and with regards to the balloon, can still be stretched.
As the skewer pushes through the balloon these polymers stretch until they reach their limit and break, forming small holes that the skewer passes through. The polymers then re-form back to their unstretched state and the balloon remains intact. Not only does the balloon remain intact but these unstretched polymers have been slightly compressed by the skewer passing through them so they push back against the skewer, forming a seal, which keeps the balloon inflated.
Piercing Balloon Stock Photos
Adding a little bit of a lubricant, like soap or oil, to the skewer before pushing it through the balloon makes it easier to get the skewer through the balloon and makes it less likely to pop. The lubricant forms a thin film between the skewer and the balloon, reducing the friction as the two materials rub against each other. This reduction in friction means that less force is required to push the skewer through the balloon. Less force means it is more likely the balloon will not stretch too much as the skewer goes through the balloon and it will remain intact.
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