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Dew know what?


I was surprised to read in your Forth Bridge article (NCE 5 February) that condensation forms on steel at 0C.

Condensation occurs when the surface temperature is at the dew point, which is related to air temperature and relative humidity.

In my time at British Rail we specified that preparation and painting should not be undertaken when the surface temperature was less than 3infinityC above the dew point, and also when the surface temperature was below 5infinityC.

M J Bedford (M), 10 Pear Tree Close, Huntington, York, YO32 9QZ

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