ABSTRACT
Salt works as a preservative of food by removing the water from food, therefore making the conditions unsuitable for bacteria and fungi to multiply. This chapter describes the procedure for investigating how the concentration of salt affects how well it preserves food. 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.
