what is the physical state of water at 100 celsius?

At 100°C, the physical state of water depends on the pressure. Under normal atmospheric pressure (1 atm), water is at its boiling point, where liquid water and water vapour (steam) coexist.

During boiling, water absorbs heat and gradually changes from the liquid state to the gaseous state. Until the entire liquid has converted into steam, both states are present together.

Key Point:

• At 100°C and 1 atm, water exists as both liquid and gas.

In simple terms: At 100°C, water is at its boiling point and can exist as both liquid water and steam simultaneously.