Why does cling film stick to your hand
It's because of Static electricity Human skin is easily positively charged. So they will forever repeat : Hope this helps. Study guides. Biology 21 cards. What are the molecules on the left side of a chemical equation called. What type of organic molecule is ATP. What is an important function of carbohydrates. What are the molecules on the right side of a chemical equation called.
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Which hand is on the top part of the stick for field hockey? Most thin plastic films easily pick up a static electric charge by friction.
In other words, plastic wrap is static electricity waiting to happen. As you pull the plastic wrap from the roll, or as it brushes against your sleeve, the friction could cause electrons to be displaced onto one area of the plastic, giving it a negative charge.
The surface that lost the electrons would then have a positive charge. Since opposites attract, the plastic wrap and any oppositely charged surface, whether that's the plate of food, your sleeve, or even another part of the plastic wrap itself, will cling to each other by electrical attraction. Give Now ». Noon Edition. Many sources say that it is static cling that keeps the wrap holding tight to everything around it.
The plastic acquires a charge and sticks itself to anything with an opposite charge. Many plastic bowls carry a very slight negative charge along their surface, giving the wrap something to hang onto - or be repulsed by. But cling wrap also manages to hang on to metal - which conducts electricity and so would eliminate a difference in charge - and glass, and itself.
Some plastic wrap is hydrophilic, grabbing on to any water it gets close to. Some is hydrophobic, repelling water. Water, unless it's pure, also conducts electricity. Plus, all wraps wad up like dirty laundry, or stick on like burrs. If static electricity made them work, they would sometimes be repelled by themselves, or other substances. That would make them impractical to use. It's materials science, not electric charge, that gives cling wrap its clinginess. Most cling wrap is made of one of two materials; polyvinyl chloride or low-density polyethylene.
Both of these are long polymers - chains of molecules.
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