ABSTRACT
This chapter describes the procedure for observing how the particles in a gas move. Brownian motion refers to the random motion of particles in a gas or liquid. It is named after the scientist Robert Brown who discovered the phenomenon in 1827 while observing particles under a microscope. This real-world science experiment is structured as a problem-solving activity thus helping KS3 science teachers to engage students effectively in the secondary school classroom. First, background science knowledge for this experiment is provided, along with the learning objectives, list of materials needed for the experiment, safety and technical notes, and a list of engaging activities to be performed by students. Data collection ideas are subsequently provided, together with useful questions to ask the students and also suggestions for homework.
