zero
(ze´ro)
the absence of all quantity or magnitude; naught.
the point on a thermometer scale at which the graduations begin. The zero of the Celsius (centigrade) scale is the ice point;
on the Fahrenheit scale it is 32 degrees below the ice point.
absolute zero
the lowest possible temperature, designated 0 on the Kelvin or Rankine scale; the equivalent of −273.15°C or −459.67°F.
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