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@wikipedia



Material

Conditions

mm

ft

Steel

sheet 

5×10−2

1.6 ×10−4


stainless

2×10−3

7×10−6


rivet

3.0

1×10−2


rusty

2.0

7×10−3

Iron

cast

2.6 ×10−1

8.5×10−4


forged

4.6 ×10−2

1.5×10−4


galvanised

1.5×10−1

5×10−4

Brass


2×10−3

7×10−6

Plastic


1.5×10−3

5×10−6

Glass


0

0

Concrete

smooth

4×10−2

1.3×10−4


rough

2.0

7×10−3

Rubber

smooth

1×10−2

3.3×10−5

Wod

plank

5×10−1

1.6 ×10−3

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