State whether each process is quasistatic, adiabatic, both, or neither for the defined system:

(a) Water boils in a pot. System: water,

(b) A balloon filled with air is slowly compressed and cooled. System: balloon and air.

(c) An initially sealed vial of air is opened in an air-filled room that is isolated from its outside environment, where the temperature and number density of air particles are the same inside and outside the vial. System: vial, room, and air.