Final answer:
To increase air pressure inside a bag, you can add more air molecules or increase the temperature of the air molecules.
Step-by-step explanation:
To increase the air pressure inside a bag containing a group of air molecules, you can add more air molecules to the bag. This can be done by using a pump to pump more air into the bag. The increase in the number of air molecules will result in more collisions with the walls of the bag, leading to an increase in pressure.
Another way to increase the air pressure inside the bag is by increasing the temperature of the air molecules. When the temperature increases, the air molecules move faster and collide with the walls of the bag with more force, resulting in an increase in pressure.
It's important to note that increasing the air pressure inside a bag has limits, as the bag can only withstand a certain amount of pressure before bursting.