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沙/砂,係由石頭分解而成嘅粒狀固體,大細由0.0625到2毫米嘅都有。
沙亦用嚟泛指形態相似嘅各種物質。
2014年有報告估計人類每年消耗超過400億噸沙同礫石。[1][2]2017年全球對沙嘅需求大約係95.5億噸。[3]人類挖嘅沙大部分用嚟整混凝土。建築用嘅沙通常係河沙。沙漠雖然有好多沙,但沙漠嘅沙太過滑,唔適合用嚟整混凝土。[4]
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