$11.$ Examine the key thermodynamic properties that make a refrigerant suitable for a specific application. How do characteristics like low boiling point and latent heat impact refrigeration efficiency?$\mathrm{}$

$12.$ Discuss the importance of chemical stability in refrigerants. How does the susceptibility to decomposition affect the long$-$term performance and safety of refrigeration systems?$\mathrm{}$

$13.$ Explain the concept of ozone depletion potential $($ODP$)$ and its relation to the environmental impact of refrigerants. How does the phase$-$out of ozone$-$depleting substances influence refrigerant selection?

$14.$ Describe the criteria for assessing the flammability of refrigerants. How do safety classifications such as A$1,$ A$2,$ B$1,$ and B$2$ aid in determining the suitability of refrigerants for specific applications?

$15.$ Explore the significance of global warming potential $($GWP$)$ in the context of refrigerants. How does GWP influence the choices made in refrigerant selection to mitigate climate change impacts?