0K = -273.15oC = -459.67oF
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zero
Sub-zero is anything that is less than zero. That means that-1 degree, -2 degrees, -3 degrees, etc. are all 'sub-zero'. To be complete, you also have to specify whether you are talking centigrade or Fahrenheit. When centigrade, it just means the same as below freezing (0 degrees centigrade). When Fahrenheit, sub zero is starting to be seriously cold since freezing is +32 degrees Fahrenheit.
zero C.
32 degrees Fahrenheit = 0 degrees Celsius.32 degrees Fahrenheit = 0 (zero) degrees Celsius
25oF. From -10oF to 0oF is 10oF From 0oF to 15oF is a further 15oF Giving a total of 10oF + 15oF = 25oF