SCIENCE: Scientists Built The World’s Fastest Water Heater, And It Sounds Totally Insane: Also, it transforms water into a completely new physical state. “That violent jiggling – for all purposes what we refer to as ‘heat’ – is equal to a scorching 100,000 degrees Celsius, way hotter than Earth’s core. What’s more, it takes less than 75 femtoseconds to accomplish this, which doesn’t give the molecules making up the trickle of water much time to escape. This sudden shock creates an unusual phase of water, one that is still a liquid but has the properties of a gaseous soup of charged particles.”