cold condensatecoldnesscollapsecollarcollar bearingcollectcolorimetercolumncombinationcombinecombustiblecombustioncombustion chambercombustion surfacecommutatorcompactcompactioncomparing elementcomparisoncompasscomplexcompositioncompoundcompound oilcompresscompressioncompression ratiocompression refrigerationcompressive strengthcompressorcomputationconcentrateconcentrationconcretecondensatecondensationcondensecondensercondensingcondensing equipmentconductconductionconduction of heatconductivityconductorconduit supportconduletconecone roofconformity