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.
126 exam-style questions on CIE IGCSE Physics 2.1.3a The absolute scale of temperature. Each one has a worked solution and a mark scheme showing where the marks go.