History of Electrum. This gold-silver alloy has a long history of being used by humans. It was used for different purposes since third millennium BC. However, the variation in the gold and silver contents of this alloy made it difficult to decide the value of each coin.
Malleability is the ability of materials to deform easily under compressive stress. This can be often characterized as materials ability to form thin sheets by hammering or rolling. On the other hand, Ductility is the ability of materials to deform easily under tensile stress.
Tensile strength is one of the important utilization properties of solid materials. However, based on the reduced size of rice husk in the previous study [11] the result of tensile strength is similar to the originally size/ungrounded rice husk in this present study.