The " U.S. Military and use of the Metric System in WW2" thread got me thinking, that there are still all sorts of measurements we use that are just awkward and confusing.
A few that come to mind:
Tire sizing. A mixture of metric, ratios, and imperial.
Piping. A 1" nominal pipe is not 1" in outer diameter, inner diameter, or between the middle of the walls.
Gauge, whether it's sheet metal, wire, bore, whatever. Sheet metal gauge is not consistent between materials, so a 16GA cold rolled steel will be a different thickness than the same gauge in aluminum. I know gauge is based off of how a certain weight of material can be reformed into different shapes, and the resulting size, but it's cumbersome.
Others?
A few that come to mind:
Tire sizing. A mixture of metric, ratios, and imperial.
Piping. A 1" nominal pipe is not 1" in outer diameter, inner diameter, or between the middle of the walls.
Gauge, whether it's sheet metal, wire, bore, whatever. Sheet metal gauge is not consistent between materials, so a 16GA cold rolled steel will be a different thickness than the same gauge in aluminum. I know gauge is based off of how a certain weight of material can be reformed into different shapes, and the resulting size, but it's cumbersome.
Others?
via International Skeptics Forum http://ift.tt/1QZ0hOB
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