Why 273 kelvin

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Chemistry - What is the equation for the reduction of water? Note: I have explained this in a very very simpler terms and used imaginary experiments which might not be possible in real world. Understanding the concept is important.

Now, Use the thermometer to find the temperature of boiling water. At the same time, see the movements of water molecules. You can see a very rapid movement. Next remove the heat from the water. The temperature drops and when the thermometer reads 0, the water freezes.

If you look at the molecular movement at this stage, it will move slowly. When you go to that stage, the thermometer would read This point is taken as 0 point in Kelvin scale. That is a decrease or increase of one Kelvin is the same as a decrease or increase of one degree Celsius. To meet these two requirements it is necessary to choose According to Halliday and Resnick, "Fundamentals of Physics" second edition, Because it is the Celsius value at which all molecular moverment stops, aka absolute zero or 0 in kelvin scale.

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Viewed 27k times. How does one come up with this? Improve this question. MarianD 2, 2 2 gold badges 10 10 silver badges 18 18 bronze badges. Add a comment. Active Oldest Votes. Improve this answer. Then there would be no lower limit.

What's important is that temperature is just energy per degree of freedom and energy is additive. We don't express pressures and volumes in terms of their logarithms, either, so it would be equally unnatural for the temperature.