At 200 degrees Celsius, water undergoes a phase transition and changes from a liquid state to a gaseous state. This transition is known as boiling.
Under normal atmospheric pressure (1 atmosphere or 101.3 kilopascals), water boils at 100 degrees Celsius. However, as the temperature increases, so does the boiling point. At 200 degrees Celsius, water reaches a temperature high enough to exceed its boiling point at atmospheric pressure.
At this temperature, water molecules gain sufficient energy to overcome the intermolecular forces holding them together in the liquid phase. They transition into a gaseous state, forming water vapor. The water molecules become more energetic and move freely, filling the available space in the container.
It's important to note that the boiling point of water can vary depending on the pressure. For example, at higher pressures, the boiling point of water increases, while at lower pressures, it decreases. However, at 200 degrees Celsius and normal atmospheric pressure, water would be in the gaseous state (as water vapor) due to the boiling process.