A sealed syringe contains a constant mass of air. The plunger is slowly pushed inwards, causing the volume of the air to decrease. The temperature of the air remains constant during this process.
How does the pressure of the air inside the syringe change and why?
The pressure decreases because the air molecules move more slowly.
The pressure decreases because the air molecules collide with the syringe walls less frequently.
The pressure increases because the air molecules move more quickly.
The pressure increases because the air molecules collide with the syringe walls more frequently.
321 exam-style questions on CIE IGCSE Physics 2.1 Kinetic particle model of matter, covering 2.1.1 States of matter and changes of state, 2.1.2a Particle structure and motion in solids, liquids and gases, 2.1.2b Gas pressure and particle collisions, 2.1.2c Brownian motion, 2.1.3a The absolute scale of temperature, and 2.1.3b Pressure, volume and temperature of a gas. Each one has a worked solution and a mark scheme showing where the marks go.