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標準狀況係物理化學入面用到嘅一套溫度同氣壓嘅標準。由於地表各處嘅溫度同壓強都不同,就算係同一地點嘅溫度同壓強,亦都隨測量時間不同而有所差異,因此科學家為徂研究方便,指定徂描述物質特徵嘅「標準狀況」:溫度0˚C(273.15 ˚K),一個標準大氣壓[1](100000帕[2];1982年前係101325帕,爾個舊標準宜家重有人用[1])。
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