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氧彈量熱法的基本原理是什麽？

发布时间：2010-04-17 点击次数：2113次

氧彈量熱法的基本原理是什麽？

◆氧彈量熱法的基本原理是：將一定量的試樣放在充有過量氧氣的氧彈內燃燒，放出的熱量被一定量的水吸收，根據水溫的升高來計算試樣的發熱量。

◆要想按照這一原理准確的測得試樣的發熱量，必須解決兩個問題：一個是要預先知道儀器的熱容量，也即該儀器的量熱系統溫度每升高1℃需要吸收的熱量，這可通過用已知熱量的基准物如苯甲酸標定儀器來解決；第二個是量熱系統與外界的熱交換問題，這可通過在量熱系統周圍加一雙壁水套，通過控制水套的溫度消除或校正量熱儀系統與外界交換來解決。解決了這兩個問題，就可較准確的測定試樣的發熱量了

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