if density of metal bar is 2.8 g/cm^3, what could be the conclusion?

comparing calculated density and the metal bar is probably Aluminum

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The bar is probably made of aluminum. The accepted value for the density of Aluminum is 2.7 g/cm^3, so your calculated density of 2.8 is within 3% of the accepted value.

If you examine a chart of accepted values for the density of various metals, you will find that most of the metals are considerably denser that aluminum, with the next nearest being titanium with a value of 4.5 g/cm^3. Looking at metals that are lighter than aluminum, magnesium is the closest at 1.7 g/cm^3. Since neither of these values is anywhere near 2.8 g/cm^3, it would be reasonable to conclude that your sample has to be made of aluminum.

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