A hand-carved sample of clay having a mass of 2.62 kN is removed from a 0.5 meter- diameter hole. The hole can be filled with 1.33 kN of water. A sample of clay having a mass of 112.4 grams is oven-dried and has a dry mass of 103.6 grams. Assuming the maximum and minimum attainable unit weight of 18.47 kN/m³ and 16.35 kN/m3 and specific gravity of 2.67, what is the relative density of the soil in percent? Relative Density= %

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Alloys

An alloy is an admixture of two or more metals or a metal and a non-metal. Since ancient times, man has been using alloys. Alloying helps to retain the properties of the parent matter, such as hardness, strength, toughness, ductility and is corrosion-resistant. Copper alloys such as brass have antimicrobial properties that help to fight against (Coronavirus disease 2019) COVID-19 and other hospital-acquired infections. Some common alloys are brass, bronze, solder steel, etc. Most alloys have a lower melting point than their constituents. This is due to the presence of a nonmetal as one of the constituents that behaves as an impurity and restricts the raise of melting point.