Chemical Engineering Thermodynamics
Which one is true for a throttling process?

The inversion temperature is the temperature at which Joule-Thomson co-efficient is infinity
The inversion temperature is different for different gases
A gas may have more than one inversion temperatures
The inversion temperature is same for all gases

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

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

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