Super Fast X-Ray Laser Heats Water to 180,000 Degrees in a Fraction of a Second

Tuesday, 15 May 2018 - 6:03PM
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Tuesday, 15 May 2018 - 6:03PM
Super Fast X-Ray Laser Heats Water to 180,000 Degrees in a Fraction of a Second
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Flickr/Ervins Strauhmanis
At first glance, hearing that "scientists heated water really fast" doesn't sound like that cool of an achievement. But it's how they did it that makes it a little more flashy.

A team of scientists at Uppsala University in Sweden have just successfully used an X-ray laser to heat room temperature water to a whopping 180,000 degrees Fahrenheit (100,000 degrees Celsius) in less than a tenth of a picosecond. That would be about a millionth of a millionth of a second, and it was done in a way that the water didn't vaporize into steam at such ridiculously high temperatures. 

To be exact, it took about 75 femtoseconds for the water to go from a glass of tap water into something several times the temperature of the sun's surface. Since it's not easy to find a laser with that much power behind it, the experiment took place at the SLAC Accelerator Laboratory at Stanford University; the researchers just published their findings in the Proceedings of the National Academy of Sciences.

So, how does X-ray heating work?



X-ray heating works pretty differently than a normal stove like whatever's attached to your kitchen. A stove simply transfers heat to water molecules to make them shake faster (after all, "fast moving molecules" is basically what heat is), but X-rays are a little more invasive to water molecules - flashes from the laser can actually force the electrons out of the molecules, causing a sudden reaction where the molecule shakes violently.

According to one of the study's authors, Carl Caleman from Uppsala University, who explained it this way in an official statement from the university:

Opening quote
"It is certainly not the usual way to boil your water. Normally, when you heat water, the molecules will just be shaken stronger and stronger. Our heating is fundamentally different. The energetic X-rays punch electrons out of the water molecules, thereby destroying the balance of electric charges. So, suddenly the atoms feel a strong repulsive force and start to move violently."
Closing quote


So far, there are only a few practical advantages to using X-ray flashes to violently dismantle and superheat water molecules. It'll be useful for more experiments involving liquids, although whatever's blasted with the laser will be destroyed in the process. But hey, you are blasting it with a laser, so you shouldn't expect any different results. 

But there's not much use the average person could get from this, so don't go expecting X-rays to replace a stove or electric kettle anytime soon.
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