ABSTRACT
The particle model explains the different properties that solids, liquids and gases exhibit. The particles in a solid are packed very tightly together. The particles are not able to move freely but do vibrate in their fixed positions. This chapter describes the procedure for classifying different substances as solids, liquids or gases. 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.
