Banyere ihe a
- Nhazi aka pụrụ iche iji kwalite nkasi obi, Nhazi ụdị nkwụ pụrụ iche iji gbochie ịchafụ nke ọma, njide mara mma, ezigbo onye inyeaka maka nhicha kichin
- Acid na alkali gburugburu ebe obibi nwere ezigbo ihe mgbochi, na-echebe aka site na kemịkalụ