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Now that you know the secret to plastic wrap’s elasticity, let’s explore why it’s sticky.
既然你已經知曉保鮮膜彈性的原理了，現在就探究下保鮮膜的粘性吧。
Most thin plastic films easily pick up a static electric charge by friction.
大多數保鮮薄膜均可通過摩擦獲得靜電荷。
In other words, plastic wrap is static electricity waiting to happen.
也就是說，保鮮膜隨時會產生靜電。
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.
當你從卷筒中抽出保鮮膜，或保鮮膜輕擦過衣袖時，摩擦導致電子轉移到保鮮膜的某一區域，該區域因此產生負電荷。
The surface that lost the electrons would then have a positive charge.
而失去電子的表面會產生正電荷。
Since opposites attract, the plastic wrap and any oppositely charged surface, whether that’s the plate of food,
由于異性相吸，不論是裝有食物的盤子、
your sleeve, or even another part of the plastic wrap itself, will cling to each other by electrical attraction.
衣袖甚至保鮮膜的其它部分，保鮮膜都會因為電荷間的相互吸引而與之貼合在一起。
譯文為可可英語翻譯，未經授權請勿轉載!
