Materials and Their Properties

Everything around us is made of materials, and each material has a set of properties — characteristics that describe what it is like and what it can do. Common properties include: hardness (how resistant to scratching), flexibility (how easily bent without breaking), strength (how much force it can withstand), transparency (whether light passes through), thermal conductivity (how well it conducts heat or cold), and electrical conductivity (whether electricity flows through it). Understanding properties helps us choose the right material for the right job. Glass is used for windows because it is transparent, letting light through while keeping out wind and rain. Metal is used for saucepans because it is a good heat conductor. Rubber is used for tyres because it is flexible and has high grip. Some materials are natural — found in nature, like wood, stone, wool, cotton and clay. Others are man-made or synthetic — created by humans through chemical processes, like plastic, glass, nylon and concrete.