Research three industrial processes that use supercritical carbon dioxide

Must be a total of 300 words; 150 for each discussion question.

Discussion 1—Carbon dioxide phase diagram

The phase diagram for carbon dioxide is available here

http://en.wikipedia.org/wiki/Supercritical_carbon_dioxide

1. Research three industrial processes that use supercritical carbon dioxide.
2. Describe the operating conditions (temperature and pressure) required and explain the steps involved and how the phase changes of carbon dioxide are advantageous to the process.

Discussion 2—Water phase diagram

The phase diagram for water can be described here.

http://www.earth.northwestern.edu/people/seth/202/new_2004/classnote_figs/h20phase.jpg

On explanation for the how ice skates work is that a thin film of liquid water is formed at the interface between the skate blade and the ice, creating a lubricating layer.

1. Assuming that this is true, refer to the phase diagram to explain why this phenomenon should occur.
2. Explain how this is consistent with what you know about the physical properties of states of water (e.g., density).