Initially the sample will be in solid form and finally it will in gaseous form.
What is melting point ?
A substance's melting point is the temperature at which it transforms from a solid into a liquid. The equilibrium between the solid and liquid phases exists at the melting point. A substance's melting point is dependent on pressure, and it is typically expressed at a standard pressure such 1 atmosphere or 100 kPa.
Melting point of nitrogen =63.15K
Boiling point of nitrogen = 77.355K
Below 63.15K it is in solid form and above this it will be in liquid form.
Below 77.355K it is in liquid form and above this it will be in gaseous form.
Initially it is 59K means in solid form.
And finally it is 129K means in gaseous form.
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