Consider a closed, rigid tank with a volume of 0.8L, filled with cold water initially at 27°C. The tank is filled such that there are no voids (air pockets) within. The initial pressure within the tank is 860 kPa. The water is being heated by an unknown source. Assume internal volume of the tank remains constant.

1. Determine the temperature, in °C, when the water reaches 3450 kPa and 6900 kPa.