Mmiri na-agafe
Ike na agafe bụ ọnụego nke nnyefe ike site n'elu. A na akọwa ọnụọgụ ahụ n'ụzọ abụọ dị iche iche, dabere na ihe gbara ya gburugburu:

 Ọnụ ọgụgụ ngụkọta nke nnyefe ike (ọ bụghị mpaghara ọ bụla); SI nkeji: W = J⋅s−1.
 Ọnụego a kapịrị ọnụ nke nnyefe ike (ngụkọta nke mpaghara ọ bụla); SI nkeji: W⋅m−2 = J⋅m− 2⋅s−1:
 Nke a bụ ọnụọgụ vector, a na-ekpebi ihe ndị mejupụtara ya n'ihe gbasara ntụziaka (nke kwụ ọtọ) na elu nke nha.
 A na-akpọ nke a mgbe ụfọdụ ike flux density, iji mee ka ọ dị iche na nkọwa mbụ.
 Radiative flux, okpomọkụ flux, na ụda ike flux bụ ihe atụ ụfọdụ nke nkọwa a.

Hụkwa 

 Mmiri na-agafe agafe (ecology)
 Ọsọ Mmiri
 Igwe ọkụ na-enwu
 Poynting vector
 Nkwado nrụgide
 Ike eletrik

Ihe odide