Is there any liquid that cannot evaporate?

Can a Liquid Truly Resist Evaporation?

No liquid is completely immune to evaporation—at least not under normal conditions. If a substance is in liquid form, its molecules are constantly in motion. Some of those molecules at the surface, moving fast enough, will escape into the air as vapor. This process is what we call evaporation.

Even liquids with very low volatility, like heavy oils or molten metals, will eventually lose molecules to the atmosphere given enough time and the right conditions. Mercury, for example, evaporates slowly at room temperature, yet its vapor is hazardous enough that it demands careful handling. On the other end, something like liquid helium, near absolute zero, behaves unusually, but still exhibits vaporization when exposed to higher temperatures.

There's an old myth that glass is a slow-moving liquid, based on the wavy appearance of ancient windowpanes. But modern science has shown that glass is actually an amorphous solid, not a liquid. So, while it may *look* like it flowed over centuries, it didn’t—it was just made unevenly and installed that way.

So, in short: if it’s truly a liquid, it can evaporate. The rate might be incredibly slow—undetectable over years or even centuries—but given the right environment and enough time, evaporation will happen. There's no known liquid that is completely locked in its phase forever.

Even in extreme environments—like deep space or ultra-high vacuum chambers—liquids tend to evaporate faster due to the lack of atmospheric pressure to keep molecules bound. That tells us something fundamental: phase change is part of what defines matter. And for liquids, evaporation isn't a flaw—it's simply how they behave in our universe.