冷卻曲線

萘從液體到固體的冷卻曲線

冷卻曲線(cooling curve)是表示物质變化的曲線,一般是由液態到固態或是從氣態到固態。其自變量(X軸)是時間,應變量(Y軸)是溫度[1],以下是一個鑄造中用到的冷卻曲線。

冷卻曲線的啟始點是物質一開始時的溫度,圖中稱為是pouring temperature。當相態改變時,即為thermal arrest(熱穩定),是一段溫度恆定不變化的區間。其原因是這段期間內,物體中的内能比其冷卻終點的内能要高,而相變化的能量差稱為 latent heat(潛熱)。cooling rate(冷卻率)是冷卻曲線中的斜率。

參考資料

  1. ^ Garland, Nibler, and Shoemaker. Experiments in Physical Chemistry (7th ed.)

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