Bubble wrap is a kind of packaging. It is made of two very thin pieces of plastic stuck together with small round air bubbles stuck inside. When these bubbles are compressed and punctured, they make a popping sound. They are commonly used as stress relievers. They are also used in packaging sensitive things that can be broken. It was invented by accident in 1957 by Alfred Fielding.
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The bubbles that cushion easily broken items can be found in many different sizes. The size of bubbles used in packaging is dependant on the size of the thing being protected. Some larger objects may need many covers of bubble wrap to be protected enough. Some mail envelopes are made out of bubble wrap.
Most kinds of bubble wrap is made out of a plastic called Polyethylene.
The bubbles can be as small as 6 millimeters (1/4 inch) in diameter, to as large as 26 millimeters (1 inch) or more. Special types of bubble wrap made out of different things can also protect items in different ways. For example, when shipping delicate electronics and components, a type of bubble wrap that uses special plastic to remove static electricity protecting delicate electronic chips.
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