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Τα περισσότερα μέταλλα είναι καλοί αγωγοί της θερμότητας, αλλά είναι στερεά σε θερμοκρασία δωματίου. Μόνο ο υδράργυρος είναι υγρός και χρησιμοποιείται σε θερμόμετρα επειδή έχει υψηλό συντελεστή επέκτασης, άρα δείχνει και την παραμικρή αλλαγή της θερμοκρασίας. Επίσης, έχει υψηλό σημείο βρασμού, οπότε μπορεί να χρησιμοποιηθεί και για μέτρηση μεγάλων θερμοκρασιών.