국토 90% 모래 사우디가 모래를 수입하는 이유
사우디 국토의 90% 모래지만
정작 건설용으로 못 쓰고 유리도 못 만든다.
너무 풍화되어 입자가 가늘고 동글동글해서 콘크리트 접합용으로 부적당
건설용 모래는 위 현미경 사진처럼 모나고 각이 져야 한다.
강모래가 가장 좋고 해안가 모래는 염도 때문에 씻어 써야 함
모래 중에 가장 좋은 모래는 반도체 만드는 데 쓰는데 모래로 가장 유명한 곳은
미국 실리콘 밸리산 모래가 가장 좋고 비싸다.
그래서 반도체 하면 미국 실리콘 밸리
2 Comments
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