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Superfluids
超流体
A superfluid is a unique type of liquid that has zero viscosity.
超流体是一种独特的液体，它的黏性为零。
This means that it will never stop flowing.
这意味着它永远不会停止流动。
The only type of liquid that scientists can turn into a superfluid is liquid helium.
科学家可以使之变为超流体的唯一一种液体是液氦。
Helium is the only substance that stays in liquid form even as its temperature approaches absolute zero.
氦是唯一一种即使在温度接近绝对零度时仍保持液态的物质。
Most substances freeze at much higher temperatures.
大多数物质在更高的温度下就已经冻结。
When liquid helium is at a very low temperature, all of its atoms have the same amount of energy.
当液氦处于非常低的温度时，它的所有原子都具有相同的能量。
This causes the substance to behave like one single atom instead of many.
这使得这一物质变得像一个原子而不是多个原子。
The atoms in superfluid helium don’t collide with each other, or transfer energy to each other.
超流氦中的原子不会相互碰撞，也不会相互传递能量。
Because of this, there is no friction between the helium atoms.
正因为如此，氦原子之间没有摩擦力。
If a scientist decided to stir a container of superfluid helium, the liquid would continue to spin around the container forever.
如果科学家决定搅动容器中的超流氦，那么这种液体将在容器中永无止尽地旋转。
