Consider a well-insulated tank of known volume. Inside the tank, there is a two-phase mixture of water at a given temperature. The volume occupied by the saturated liquid water is known. At some point, a vacuum pump is activated to supply saturated water vapor to an industrial process until the water reaches a final temperature. What is the purpose of the vacuum pump in this scenario?
1) To increase the pressure inside the tank
2) To decrease the pressure inside the tank
3) To maintain the pressure inside the tank
4) To control the temperature inside the tank