Sustainable applications in many different areas

Solid lines ( j are pure component vapor pressure ciuves. 

The filled circles are pure component critical points 

Type 1 mixtures have continuous gas-liquid critical line and exhibit complete miscibility of the hquids at all temperatures. Mixtures of substances with comparable critical properties or substances belonging to a homologous series form Type 1 unless the size difference between components is large. The critical locus could be convex upward with a maximum or concave down with a minimmn. Examples of Type 1 mixtures are Water + 1-propanol, methane + n-butane, benzene + toluene, and carbon dioxide + n-butane. 

Type II have systems have liquid-liquid immiscibility at lower temperatures while locus of liquid-liquid critical point (UCST) is distinct from gas liquid critical line. Examples include water + phenol, water + tetralin, water + decalin, carbon dioxide + n-octane, and carbon dioxide + n-decane. 

When the mutual immiscibihty of two components becomes large, the locus of liquid-liquid critical solution moves to higher temperatures and it eventually interacts with gas-liquid critical cmwe disrupting the gas-liquid locus. This particular class is type III and some examples include water + n-hexane, water + benzene, carbon dioxide + n-tridecane, and carbon dioxide + water. 

---

For space environments for humans to become feasible, further research and development must take place in three main areas fife-support systems and shielding, types of space-bound habitats, and resources to sustain habitat populations. Given the vast number of possibilities within these scenarios, there are many considerations that will take precedence over others as humankind progresses toward a more developed future in space. For example, the operating conditions, power resources needs, and amenities aboard a habitat built for long-term, near-Earth orbit will be very different from those for a round-trip to the Moon or Mars. Despite these differences, there are many other areas in which research and development could uncover certain universally applicable materials and techniques. 

---