Wouldn't the theoretical lowest temperature on die be above 0 degrees celcius for this, as it's water? They give figures for pressure, although I don't know what 30KPa is in millibar. I mean, you can "boil" water at room temperature in a vacuum, so maybe if it's a low pressure, the water wouldn't be able to freeze. Good to see all these developments though, it's always nice to play with some new technology
