At the Fermi level (or chemical potential), the probability of a state being occupied is 1⁄2. If the Fermi level is in the middle of a band gap of 1 eV, this probability is "e"−20 or about 2.0⋅10−9 at the room-temperature thermal energy of 25.9 meV.
æ t WORD_BOUNDARY ð ə WORD_BOUNDARY f ɜː m i WORD_BOUNDARY l ɛ v ə l WORD_BOUNDARY ɔ ɹ WORD_BOUNDARY k ɛ m ɪ k ə l WORD_BOUNDARY p ə t ɛ n ʃ ə l WORD_BOUNDARY ð ə WORD_BOUNDARY p ɹ ɑ b ə b ɪ l ɪ t i WORD_BOUNDARY ə v ə WORD_BOUNDARY s t eɪ t WORD_BOUNDARY b iː ɪ ŋ WORD_BOUNDARY ɑ k j ʊ p aɪ d WORD_BOUNDARY ɪ z WORD_BOUNDARY w ʌ n WORD_BOUNDARY t uː WORD_BOUNDARY ɪ f WORD_BOUNDARY ð ə WORD_BOUNDARY f ɜː m i WORD_BOUNDARY l ɛ v ə l WORD_BOUNDARY ɪ z WORD_BOUNDARY ɪ n ð ə WORD_BOUNDARY m ɪ d ə l WORD_BOUNDARY ə v ə WORD_BOUNDARY b æ n d WORD_BOUNDARY ɡ æ p WORD_BOUNDARY ʌ v WORD_BOUNDARY w ʌ n WORD_BOUNDARY iː WORD_BOUNDARY v iː WORD_BOUNDARY ð ɪ s WORD_BOUNDARY p ɹ ɑ b ə b ɪ l ɪ t i WORD_BOUNDARY ɪ z WORD_BOUNDARY iː WORD_BOUNDARY m aɪ n ə s WORD_BOUNDARY t w ɛ n t i WORD_BOUNDARY ɔ ɹ WORD_BOUNDARY ʌ b aʊ t WORD_BOUNDARY t uː WORD_BOUNDARY z iə ɹ oʊ WORD_BOUNDARY t ɛ n WORD_BOUNDARY m aɪ n ə s WORD_BOUNDARY n aɪ n WORD_BOUNDARY æ t WORD_BOUNDARY ð ə WORD_BOUNDARY ɹ uː m t ɛ m p ɹ ɪ t̠ʃ ə ɹ WORD_BOUNDARY θ ɜː m ə l WORD_BOUNDARY ɛ n ə ɹ d̠ʒ i WORD_BOUNDARY ʌ v WORD_BOUNDARY t w ɛ n t i WORD_BOUNDARY f aɪ v WORD_BOUNDARY n aɪ n WORD_BOUNDARY m iː WORD_BOUNDARY v iː WORD_BOUNDARY