Chemical Engineering Thermodynamics
Choose the condition that must be specified in order to liquify CO₂ (triple point for CO₂ is - 57°C and 5.2 atm).

Pressure and temperature must be kept below 5.2 atm. and - 57°C respectively
Pressure must be kept below 5.2 atm
Pressure must be kept below 5.2 atm. and temperature must be kept above 57°C
Temperature must be kept above - 57°C

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Chemical Engineering Thermodynamics
A large iceberg melts at the base, but not at the top, because of the reason that

Due to the high pressure at the base, its melting point reduces
Ice at the base contains impurities which lowers its melting point
All of these
The iceberg remains in a warmer condition at the base

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