교과서 Material：
유음화. [유음화] to [유으뫄]. yu-eum-hwa to yu-eu-mwa .
ㄹ Liquidization.
해설 Commentary：
유음화 = 유음 (liquid sound) + 화 (to become).
유음화 [yu-eu-mwa] is one of the Korean sound shifts.
In Korean, the consonant ㄹ [ri-eul] is called 유음 [yu-eum] = Liquid Sound.
When ㄴ [ni-eun] and ㄹ [ri-eul] are adjacent, 유음화 [yu-eu-mwa] = Becoming Liquid Sound occurs. As a result, ㄴ [ni-eun] changes to ㄹ [ri-eul].
When romanized, this ㄹㄹ sound is spelled as "ll" not "rl" in the alphabet.
Some textbooks introduce 유음화 [yu-eu-mwa] as Smoothing.
Example of 유음화 ㄹ Liquidization：
관리. [관리] to [괄리]. gwan-ri to gwal-ri to gwal-li.
Management.
관리 = 관(pipe) + 리(reason).
관리 [gwal-li] means Management in Korean.
관 [gwan] means Pipe, and 리 [ri] means Reason.
The correct pronunciation of 관리 is 괄리 [gwal-li], and 관리 [gwan-ri] is incorrect. In this case, the ㄴ [ni-eun] in 관 and the ㄹ [ri-eul] of 리 are adjacent, so 유음화 [yu-eu-mwa] = ㄹ Liquidization occurs. As a result, ㄴ [ni-eun] changes to ㄹ [ri-eul].
실내. [실내] to [실래]. sil-nae to sil-rae to sil-lae.
Inside.
실내 = 실(room) + 내(in).
실내 [sil-lae] means Inside in Korean.
실 [sil] means Room, and 내 [nae] means In.
The correct pronunciation of 실내 is 실래 [sil-lae], and 실내 [sil-nae] is incorrect. In this case, the ㄹ [ri-eul] in 실 and the ㄴ [ni-eun] of 내 are adjacent, so 유음화 [yu-eu-mwa] = ㄹ Liquidization occurs. As a result, ㄴ [ni-eun] changes to ㄹ [ri-eul].
Related words of 유음화 ㄹ Liquidization：
데이터 Data：
유음화[yu-eu-mwa] ㄹ Liquidization
DATA
소리[sori] Voice
DATA
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This page shows the basic words to start learning Korean and East Asian languages.
연구 Further study：
Yonsei Korean 1-1. Yonsei Language Institute.
Integrated Korean. Beginning 1. Young-Mee Cho. Univ of Hawaii Press.
Republic of Korea Ministry of Education (대한민국
교육부).
Japan Ministry of Education (文部科学省).
学習指導要領 生きる力. 2017.
People's Republic of China Ministry of Education (
中华人民共和国教育部). Tōngyòng Guīfàn Hànzì Biǎo (通用规范汉字表). 2013.
U.S. Department of Education.