Final answer:
In a pressure cooker, the boiling point of water is raised due to the increased air pressure. Water freezing occurs when the water molecules slow down and form a solid ice crystal lattice.
Step-by-step explanation:
In a pressure cooker, when the lid is tightly screwed onto a pot, the air pressure inside the pot increases. This, in turn, raises the boiling point of the water in the pot.
The process of water freezing involves the water molecules slowing down as they lose thermal energy. This decrease in energy causes the water molecules to come closer together and form a solid ice crystal lattice.
Learn more about Boiling point of water and water freezing