Air in a sealed syringe is slowly compressed by moving the piston. The temperature of the air stays the same.
Which statement about the air is correct?
The pressure of the air decreases because its molecules now travel more slowly.
The pressure of the air increases because its molecules now hit the syringe walls more frequently.
The pressure of the air decreases because the area of the syringe walls is now smaller.
The pressure of the air increases because its molecules now travel more quickly.
