Development of Experimental Set for Measuring Liquid Density Based on Hydrostatic Pressure Ang Hooke’s Law

Density of a substance defined as its mass per unit volume is an importance characteristic of a matter, especially the density of liquid. It can provide valuable information for serving numerous purposes and making decision relating to the production process. However, the difficulties are encountered when measuring the density of liquid in daily life. This research aims to design and construct an experimental set for measuring the liquid density integrating the physics concepts of hydrostatic pressure and Hooke's law. The local materials (e.g., a PVC pipe, acrylic pipe, and spring), sensor interfaced with microcontroller, and smartphone application were achieved for construction of the economical, easy-to-use, and fascinating liquid density measuring instrument. Various liquids with different densities including deionized water, ethanol, glycerin, cooking oils, and cane sugar syrup were used to test the performance of the developed liquid density measuring instrument. The results showed that the obtained percentage error was below 5.5%. It indicated that the developed experimental set can be applied to measure the liquid density in daily life.