Question

Describe any changes that can be observed in a sample of solid argon when the temperature increases from 40k to 160K at a constant pressure of 0.50 atmosphere

Answer 1

The temperature and pressure of the triple point of Ar are:

Pt=0.689 atm and Tt= 83.8K

This means we start at solid state below the triple point pressure. when we increase the temperature above the boiling temperature at the corresponding pressure the solid argon change directly into gas phase.