specific weight

The concept of specific weight is generally often confused with density. However, it is important to emphasise that specific weight actually refers to the weight force of a material in relation to a specific reference substance. In other words, it is a measurement that indicates how much heavier or lighter a particular material is compared with a defined reference material.

This difference between specific weight and density can lead to confusion. While density describes the ratio of mass to volume of a material, specific weight additionally takes gravitational force into account. It is a way in which we can interpret the weight of a material in a particular gravitational field.

Specific weight is often represented by the Greek letter gamma (γ) and measured in units such as kilogrammes per cubic metre (kg/m³) or pounds per cubic foot (lb/ft³). It is an important physical property of materials that is used in various fields such as engineering, construction and science to characterise materials and determine their usability for specific applications.