1. Design a system to cut ice into various two-dimensional shapes using localized pressure to produce a phase change and thus locally "melting" out the desired shape. (Suggestion: Try a highpressure "cookie-cutter" technique.)
2. Design a fire extinguisher system that expands liquid carbon dioxide under a suitable pressure at ambient temperature (which can vary by ±50.0°C) and produce a fine spray of solid carbon dioxide particles at high velocity and low temperature.