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Similar - They're both metals, and they both can be recycled. Differences - density, electronegativity, orbital structure, atomic number, heat capacitance, conductance, monetary value, sheen...almost everything else.
An aluminum bar is 2 m long at a temperature of 20° C. What will be the length of the bar at a temperature of 1000 C
Depends on the size of the bar. There is no "standard" size of a silver bar, there are silver bars ranging anywhere from 1 gram to bars to many hundred kilograms. The most common size is 1 troy ounce which is worth ~$31 at current silver prices.
Both bar graphs and picture graphs show statistics (data) in a visual (graphic) form.
The silver value of such a bar would be about $2.25 (based on the December 14, 2007 price of silver of $13.98 per troy ounce). An expert would need to see the design and condition of the bar to determine if it had numismatic value above the intrinsic metal value.