5kg

5kg is a unit of mass equal to five kilograms. The kilogram is the SI base unit of mass, defined as the mass of the International Prototype Kilogram, a platinum‑iridium alloy cylinder kept at the International Bureau of Weights and Measures in France. Since 2019 the definition has been based on fixed numerical values of fundamental constants, removing dependence on a physical artifact.

In everyday use, 5kg is a convenient reference for groceries, laboratory samples, and shipping weights. In retail, a bag of flour or sugar weighing about 5kg is common in many markets, giving a tangible sense of bulk for consumers. In shipping, many postal services list 5kg as a threshold for standard weight classes, influencing pricing for parcel delivery. In sports, a 5kg medicine ball is frequently used for strength training and plyometrics, providing a moderate challenge for functional movement and conditioning exercises. A 5kg bag of sand or gravel is a typical load for use in construction or landscaping projects. In scientific contexts, a 5kg mass is often employed in physics laboratories for demonstrating principles such as buoyancy, mass‑velocity relations, or as a standard weight in calibration exercises.

Because of its moderate size and ease of handling, 5kg functions as a practical unit across many domains, from everyday commerce to educational settings.