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Titik lebur

Titik lebur atau titik leleh dari sebuah benda padat adalah suhu di mana benda tersebut akan berubah wujud menjadi benda cair. Ketika dipandang dari sisi yang berlawanan (dari cair menjadi padat) disebut titik beku.

Pada sebagian besar benda, titik lebur dan titik beku biasanya sama. Contoh, titik lebur dan titik beku dari "raksa" adalah 234,32 K (−38,83 °C atau −37,89 °F) Namun, beberapa subtansi lainnya memiliki temperatur beku <--> cair yang berbeda. contohnya "agar-agar", mencair pada suhu 85 °C (185 °F) dan membeku dari suhu 32-40 °C (89,6-104 °F); fenomena ini dikenal sebagai histeresis.

Beberapa benda lainnya, seperti kaca, dapat mengeras tanpa mengkristal terlebih dulu; ini disebut padatan nirwujud. Tidak seperti titik didih, titik lebur tidak begitu terpengaruh oleh tekanan.

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