Ụdị valvụ osisi kemịkalụ na ebe ntinye (nwere ụdị nrụpụta)
Chemical osisi valvụ ụdị na ngwa ebe (na ụdị irè) Mgbe mmepụta nke uzuoku engines, n'ime gara aga iri abụọ ma ọ bụ afọ iri atọ, n'ihi mkpa nke crude mmanụ, chemical osisi, ike osisi, metallurgical ụlọ ọrụ, ụgbọ mmiri, nuklia ike ge. ..
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