What is the number of kelvins between the freezing point and the boiling point of water at a pressure of 1 atm?

100 K

Explanation:

We know that Freezing Point of water is at 1 atm

Converting it to Kelvin we get 273.15 K

Boiling Point of water is

converting it to Kelvin we get 373.15 K

Difference in the number we get =373.15-273.15=100 K

Temperature difference is independent of degree and will remain same for Celsius and Kelvin

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measuring things 1 litre of water