開爾文者，所以言溫度之高低也，常書K以代之，略稱開。萬國公制七礎之一。用於熱力學溫標，以絕對零度爲準。蓋絕對零度乃極寒之溫，萬物莫能寒于此，故熱力學溫標無負數。至於溫差，與攝氏度同，則二百七十三點一五開時，冰化爲水。
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