The thickness of a dime.
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0.73 mm would be hard to see, anywhere. If you cut up 1 inch into 35 pieces, each piece is about 0.73 mm.
It is the same as 1.66 cm
http://wiki.answers.com/Q/What_does_a_2_mm_diameter_object_look_like"
Convert the km to mm, then the units can be removed and the ratio found: 1 m = 1,000 mm 1 km = 1,000 m = 1,000 x 1,000 mm = 1,000,000 mm ⇒ 1 mm : 50 km → 1 mm : 50 x 1,000,000 mm → 1 mm : 50,000,000 mm → 1 : 50,000,000
127x177.8 mm if it was inches 1524x2133.6 mm if it was feet 1 inch= 25.4 mm 1 foot +304.8 mm