When water is boiling, what is true about the water in the boiler and the steam above it?

When water is boiling, it transitions from the liquid phase to the gaseous phase, which creates steam. At boiling point, the temperature of the boiling water and the steam above it are indeed at the same temperature, provided that the system is in equilibrium. This means that the water in the boiler and the steam that is produced above it share the same temperature because of the energy exchange occurring during the phase change.

At this stage, both the liquid water and the steam are also at the same pressure, which is determined by the boiling point of the water for a given atmospheric pressure. For example, if the boiling point of water is 100 degrees Celsius at 1 atmosphere of pressure, both the water and the steam will be at this temperature and pressure under these conditions.

In this context, statements regarding differing pressures or temperatures between the steam and water would not be accurate during the boiling process, as equilibrium must be maintained for the phase change to persist. Therefore, the assertion that they are at the same temperature and pressure is fundamentally correct.