The process of eliminating other factors that would make the reading wrong. Like the weight of the container for the substance being weighed.
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Kelvin Scale.
It isn't. "Absolute zero" is zero on the Kelvin scale, 273.15 degrees colder than zero Celsius.
Absolute zero is 0 K, the Kelvin scale, or -273.15 °C, the Celsius (centigrade) scale, or −459.67°F, the Fahrenheit scale. (It's also 0 °R, the Rankine scale.)A link to the Wikipedia post on absolute zero is provided. You'll find that link below.
On the Fahrenheit scale. Water freezes at zero on the Celsius scale.
-273.15 on the Celsius Scale and -459.67 on the Fahrenheit scale