Some tiny smoke particles are suspended in a sealed glass cell containing air. A bright beam of light is shone through the cell, and the smoke particles are viewed under a microscope. The smoke particles are observed to move with a rapid, jerky, and random motion.
What name is given to this motion of the smoke particles?
Explain, in terms of air molecules, why the smoke particles behave in this way.
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.