Akara akara ọkụ ozugbo bụ ụdị akara na-efu ọnụ nke ejiri usoro mbipụta ọkụ ozugbo mee.N'ime usoro a, a na-eji isi ebipụta thermal na-ahọrọ ikpo ọkụ dị iche iche nke akwụkwọ mkpuchi, thermo-chromatic (ma ọ bụ thermal).