Using a digital scale as a densimeter and its application for solids and liquids

In this work we show how a low cost digital scale and some simple devices such as beaker, support, wires, cord, plastic bag and water can be used to measure the density of solids and liquids. The proposed mounting can be done simply, quickly and cheaply. The physical principles used and the mathematical equations involved are presented in a simple and didactic way, what makes it possible to use the ideas presented in different environments such as classrooms, teaching laboratories or even at home. Despite the simplicity, the precision and accuracy of the measurements are not lost. As an example, we illustrate its use in determining the density of various materials.