📝 Multiple Choice Question
General-science
Which of the following gases, when cooled and compressed, can change from a gas to a supercritical fluid state?
A
Steam
B
Carbon dioxide (CO2)
C
Hydrogen (H2)
D
Oxygen (O2)
Explanation
Carbon dioxide (CO2) is widely used in industry as a supercritical fluid because its critical temperature (31.1°C) and critical pressure are relatively easy to achieve. In this state, it acts as a highly effective, environmentally friendly solvent for decaffeinating coffee and extracting essential oils.
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