What are the physical quantity that measured by watt per meter kelvin and which that starts with the letter c
SELECT DISTINCT ?sbj ?sbj_label WHERE { ?sbj wdt:P31 wd:Q107715 . ?sbj wdt:P1880 wd:Q1463969 . ?sbj rdfs:label ?sbj_label . FILTER(STRSTARTS(lcase(?sbj_label), 'c')) . FILTER (lang(?sbj_label) = 'en') } LIMIT 25 
physical quantity: Q107715 watt per metre kelvin: Q1463969