40 kelvin = -387.67 degree Fahrenheit.
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300 Kelvin is hotter than both 90 degrees Fahrenheit and 40 degrees Celsius. Kelvin is an absolute temperature scale where 0 Kelvin represents absolute zero, the coldest temperature possible. 300 Kelvin is equivalent to 80.33 degrees Fahrenheit and 26.85 degrees Celsius.
To convert Kelvin to Fahrenheit, use the formula F = (K - 273.15) x 1.8 + 32. For example, if you have 300 Kelvin, the conversion to Fahrenheit would be (300 - 273.15) x 1.8 + 32 = 80.33°F.
-40 degrees Celsius is equal to -40 degrees Fahrenheit.
At -40 degrees on both scales.
If the temperature at the North Pole is -40°C, it is also -40°F. To convert Celsius to Kelvin, you would add 273.15 to the Celsius temperature, so in this case, it would be 233.15 Kelvin.