Ọnụ ụzọ ngwa ngwa siri ike bụ ụdị ọnụ ụzọ ngwa ngwa igwe ọhụrụ nke na-egbochi izu ohi na oke okpomọkụ. Ọ bụ ihe a pụrụ ịdabere na ya, bara uru ma dị mfe iji rụọ ọrụ. A na-eji ya n'ọtụtụ ebe n'ime ebe a na-adọba ụgbọala n'okpuruala, ụlọ ọrụ na-emepụta ụgbọala, nri, kemikal, textiles, electronics, supermarkets, refrigeration, log ...
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