In general, the highest temperature of liquid water is the boiling point, because the water will undergo a phase change at the boiling point to become gaseous, and the temperature above the boiling point can only exist in the gaseous state. The boiling point of water is not set in stone, and what we often say about water boiling at 100 is actually at standard atmospheric pressure.
The boiling point is the temperature at which the saturated vapor pressure of the liquid is equal to the outside pressure, so at high altitudes the air pressure is low, and the water boils before it reaches 100, while the water in the pressure cooker can reach more than 100. As heat and pressure are continuously increased, the water will cross the critical point and become a supercritical fluid.
At this time, the state of water is different from both gaseous and liquid state, its density is two orders of magnitude greater than that of gas, similar to that of liquid, but the viscosity is smaller than that of liquid, and it is easy to diffuse.
In addition, the boiling of water requires a condition, that is, there need to be tiny bubbles in the water or tiny bubbles on the surface of the container wall or air in the extremely small cracks on the surface of the container, otherwise it is easy to form superheated water. Superheated water is water that is not boiling at a temperature that should be boiling, and the temperature of the water can be higher than the boiling point. However, superheated water requires extremely high water purity and is generally not easy to form.
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