# Question #1d40d

Mar 26, 2017

Pure water? No. At the pressure required for water to be able to boil at $0 \text{°C}$ it cannot exist as a liquid.

#### Explanation:

Above is the phase diagram of water. The boiling point at a given pressure is the temperature coordinate of the line between the regions labelled "Liquid" and "Gas" for that pressure coordinate.

As you can see, there is no point on that line where the temperature is $0 \text{°C}$. At that temperature water can only be a solid or a gas at pressures low enough for boiling to possibly occur. Water can turn to a gas at $0 \text{°C}$, but not from a liquid so it is technically sublimation, not boiling.