Choose the condition that must be specified in order to liquify CO2 (triple point for CO2 is 57C and 5.2 atm) ?
A. Pressure and temperature must be kept below 5.2 atm. and 57C respectively
B. Temperature must be kept above 57C
C. Pressure must be kept below 5.2 atm
D. Pressure must be kept below 5.2 atm. and temperature must be kept above 57C
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