CM has various meanings in the Ordnance Survey category. Discover the full forms, definitions, and usage contexts of CM in Ordnance Survey.
A distinct compound or substance, especially one which has been artificially prepared or purified.
Ordnance SurveyBeads or drops of water (and frequently frost in extremely cold weather) that accumulate on the inside of the exterior covering of a building. Use of louvers or attic ventilators will reduce moisture condensation in attics. A vapor barrier under the gypsum lath or dry wall on exposed walls will reduce condensation. A hollow concrete ‘brick’ often 8? x 8? x 16? in size.
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