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B1 中級 英語 4:51 Educational

Which is stronger: Glue or tape? - Elizabeth Cox

TED-Ed · 15,045,215 回視聴 · 追加日 2週間前

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B1

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00:07

The oldest glue in the world is over 8,000 years old

00:11

and comes from a cave near the Dead Sea.

00:14

Ancient people used this glue,

00:16

made from a mixture of animal bone and plant materials,

00:20

to waterproof baskets and construct utensils.

00:23

And for thousands of years after,

00:25

plants and animals were the glue that held human civilization together.

00:29

Today, we have enough types of tape and glue to build and repair almost anything.

00:34

But what gives glue and tape their stickiness?

00:38

And is one stronger than the other?

00:41

Adhesives can be made from synthetic molecules

00:44

or natural proteins and carbohydrates

00:47

like the vegetable starch dextrin,

00:49

the milk protein casein,

00:51

and the terpenes in tree resin.

00:53

In order to work, glue and tape need both adhesive bonds and cohesive bonds.

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