Because the slower molecules get, the colder it is. When molecules come completely to a stop (at zero movement), the temperature is -273.15 degrees Celsius.
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-273 celsius is very close to absolute zero, the coldest temperature physically possible in the universe.-273 celsius is equal to -459.4 degrees Fahrenheit.
Minus 273 degrees Celsius is the coldest possible temperature, a.k.a. "absolute zero".
It you mean -273°F the the answer is -169°C.
To convert from Celsius to Kelvin, you add 273. To convert from Kelvin to Celsius, you subtract 273.
273