The answer lies in a clever combination of intermolecular forces and stuctural engineering.

案是之间的作用力与构工程的巧妙合。

Cohesion means the strength of intermolecular forces that hold the material together.

内聚力指把物质合在一起的间作用力强度。

They are used to help it grip to surfaces using intermolecular forces.

它们帮助壁虎抓住物体表面采用间作用力。

But polymers within the SPN are crosslinked by more transient intermolecular forces, such as hydrogen bonding.

但SPN内部的聚合物则更多是由瞬态间作用力交联的，例如氢键。

The other main type of intermolecular forces are " dipole-dipole forces."

另一种主要类型的间力是“偶极-偶极力” 。

The only intermolecular force that's holding two methane molecules together would be London dispersion forces.

唯一将两个甲烷合在一起的间力是伦敦色散力。

It's very weak, which is why London dispersion forces are the weakest intermolecular forces.

它非常弱，这就是为什么伦敦色散力是最弱的间力。

We're talking about an intermolecular force.

我们谈论的是间作用力。

But it is the strongest intermolecular force.

但它是最强的间作用力。

It's happening because of what we call " intermolecular forces."

它的发生是因为我们称之为“间作用力” 。

Here's your hydrogen showing intermolecular force here.

这是你的氢在这里显示间力。

But, do not get me wrong, here. I'm not saying that intermolecular forces aren't important.

但是，不要误会我的意思，在这里。我并不是说间作用力不重要。

There are basically 2 main types of intermolecular forces.

基本上有两种主要类型的间作用力。

So these are the weakest intermolecular forces, and they have to do with the electrons that are always moving around in orbitals.

所以这些是最弱的间力，它们与总是在轨道上移动的电有关。

Let's look at another intermolecular force.

让我们看看另一种间作用力。

And an intermolecular force would be the force that are between molecules.

间力就是之间的力。

And so let's look at the first intermolecular force.

那么让我们看看第一个间力。

The strength of that surface tension depends on the intermolecular forces that pull molecules of a liquid together.

表面张力的强度取决于将液体拉到一起的间作用力。

And it has to do with the intermolecular force of dipole-dipole interactions holding those molecules together.

它与将这些合在一起的偶极-偶极相互作用的间作用力有关。

And the intermolecular force, in turn, depends on the electronegativity.

而间力又取决于电负性。