* Liquid CO2 is carbon dioxide in its liquid state.
* Dry ice is solid CO2.
The process is not about liquid CO2 vaporizing into dry ice. Instead, it's about liquid CO2 directly turning into solid CO2 (dry ice) through a process called sublimation.
Here's a more detailed explanation:
1. Liquid CO2 at atmospheric pressure is unstable. CO2 has a very low critical temperature, meaning it can't exist as a liquid at normal atmospheric pressure.
2. Sublimation: When liquid CO2 is released into the atmosphere, it undergoes a rapid change of state, skipping the liquid-to-gas (vaporization) step and directly turning into solid CO2 (dry ice). This happens because the pressure drops significantly, and the CO2 molecules lose energy, causing them to solidify.
3. Dry ice: The solid CO2, also known as dry ice, is very cold (-78.5 °C or -109.3 °F). It doesn't melt into a liquid like regular ice; it directly sublimates back into gaseous CO2.
In essence, liquid CO2 doesn't vaporize and then turn into dry ice. Instead, it undergoes a direct transformation from liquid to solid due to pressure changes and a drop in energy.
