A celsius and kelvin converter

You will write three small functions: one changes degrees celsius to kelvin, one changes kelvin back to celsius, and one says whether water is a solid, a liquid or a gas at a temperature in celsius. The program then prints a table of temperatures.

The idea. $\text{K} = {}^\circ\text{C} + 273$, and ${}^\circ\text{C} = \text{K} - 273$. At normal pressure water is ice below $0\ ^\circ\text{C}$, liquid from $0\ ^\circ\text{C}$ up to $100\ ^\circ\text{C}$, and steam from $100\ ^\circ\text{C}$.

Your tasks.

1. Make to_kelvin(celsius) give the temperature in kelvin.
2. Make to_celsius(kelvin) give the temperature in degrees celsius.
3. Make state_of_water(celsius) give "solid", "liquid" or "gas".