標準大氣壓（atm）係壓強單位。舊標準嘅1標準大氣壓等如101325帕[1]。1982年，理論化學和應用化學國際聯會（IUPAC）建議將標準大氣壓嘅定義改為100000帕[2]，但係舊標準101325帕就宜家都重有人用[1]。
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