1 micrometre (µm) equals 0.00003937 inches, therefore 0.5 micrometre equals 0.000019685 inches.
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19 inches
1303 Nickels stacked up would be roughly 100 inches. A nickel is 1.95mm thick which is 0.07677165 inches thick.
5inches
36 tonnes
That would depend on how thick the polythene sheets were.