These atoms merge to form a pi bond.

这些原子合并形成π键。

You would have to break the pi bond, and thus, the entire molecule to rotate between isomers.

你必须打破 pi 键，因此，整个分子才能在异构体之间旋转。

Double bonds consist of a sigma bond and a pi bond.

双键由西格玛键和π键组成。

The pi bonds within each sheet is really strong which allows graphite to withstand a lot of pressure.

每片中的 pi 键非常牢固， 使石墨能够承受很大的压力。

That pi bond bridges the sigma bond, locking it in place.

那个 pi 键桥接 sigma 键，将它锁定到位。

That means that there are no unstable pi bonds, so they tend to have longer shelf lives.

这意味着不存在不稳定的π键，因此它们的保质期往往更长。

These orbitals form pi bonds that merge into an extensive network on their own and this gives the structure its real strength.

这些轨道形成 pi 键， 它们自己合并成一个广泛的网络，这赋予了结构真正的力量。

The triple bonds in alkynes, meanwhile, are composed of 1 sigma bond and 2 pi bonds for a total of 3 bonds.

同时，炔烃中的三键由 1 个 sigma 键和 2 个 pi 键组成，总共 3 个键。

This is because the carbon atoms in diamonds share sigma bonds, not pi bonds, which doesn't allow the electrons much freedom of movement.

这是因为钻石中的碳原子共享 sigma 键， 而不是 pi 键，这不允许电子有太多的运动自由度。

And because the electrons that form the pi bonds in the graphite are able to move from one atom to another, graphite also conducts electricity.

而且由于在石墨中形成 pi 键的电子能够从一个原子移动到另一个原子，因此石墨也导电。

The molecule itself is now a newly formed free radical, and it attack another nearby pi bond, joining with another molecule of ethene, forming another radical.

该分子本身现在是一个新形成的自由基，它攻击附近的另一个 pi 键， 与另一个乙烯分子结合， 形成另一个自由基。

Pi bonds are significantly more unstable than sigma bonds, so double and triple bonds are pretty easy to break, opening the doors for some good chemistry.

Pi 键明显比 sigma 键不稳定，因此双键和三键很容易断裂， 为一些良好的化学反应打开了大门。

One oxygen will line up to form a pi bond with the vertically oriented p orbital from the carbon and the other will line up with the horizontally oriented one.

一个氧将与碳的垂直方向的 p 轨道对齐形成 pi 键，另一个将与水平方向的轨道对齐。

The pi bonds prevent the triple bonds from rotating here as well, but triple bonded carbons can only bond to one other atom, so even if it could rotate, nothing would change.

π键也阻止三键在这里旋转，但是三键碳只能与另一个原子键合， 所以即使它可以旋转， 也不会发生任何变化。