At 25 degrees Celsius (77 degrees Fahrenheit), water is in its liquid state under normal atmospheric conditions at sea level. Water transitions from a solid (ice) to a liquid state at 0 degrees Celsius (32 degrees Fahrenheit) through the process of melting, and from a liquid to a gaseous state (water vapor) at 100 degrees Celsius (212 degrees Fahrenheit) through the process of boiling. Therefore, at 25 degrees Celsius, water remains in its liquid form.