The first law of thermodynamics says that energy can't be created or destroyed.

热力学第一定律说能量不能被创造或毁灭。

The first law of thermodynamics tells us that energy can neither be created nor destroyed.

热力学第一定律告诉我们，能量既不能被创造，也不能被毁灭。

Because the first law of thermodynamics says that nothing can be created or destroyed.

因为热力学第一定律说没有任何东西可以被创造或毁灭。

But this is all just the first law of thermodynamics.

但这一切只是第一定律 在热力学中。

Hess's Law, which also kind of led directly to the first law of thermodynamics.

赫斯定律，它也直接导致了热力学第一定律。

Again, the equation for the first law of thermodynamics helps us out here.

再次，第一定律的方程 热力学将帮助我们。

In the end, though, these prototypes ran into a teensy-tiny problem: the first law of thermodynamics.

但最终， 这些原型遇到了一个极小的问题：热力学第一定律。

For each of these machines to keep moving, they'd have to create some extra energy to nudge the system past its stopping point, breaking the first law of thermodynamics.

为了让每台机器继续运动，它们必须创造一些额外的能量来推动系统越过停止点，打破热力学第一定律。

Even if engineers could somehow design a machine that didn't violate the first law of thermodynamics, it still wouldn't work in the real world because of the second law.

即使工程师能以某种方式设计出不违反热力学第一定律的机器，由于第二定律，它仍然无法在现实世界中工作。

Today, you learned about the first law of thermodynamics, and how it applies to isovolumetric, isobaric, isothermal, and adiabatic processes.

今天，你了解了动力学第一定律 热量，它如何适用于。

This idea – that the change in internal energy is equal to the change in work plus the change in heat – is so fundamental that it's known as the first law of thermodynamics.

这个想法——内能的变化 等于工作变化加上工作变化。