Engineering Thermodynamics
The absolute zero pressure will be

At the temperature of - 273 K
At sea level
When molecular momentum of the system becomes zero
At the center of the earth

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Engineering Thermodynamics
Mond gas is obtained by

Carbonisation of bituminous coal
Passing air and a large amount of steam over waste coal at about 650°C
Passing steam over incandescent coke
Partial combustion of coal, coke, anthracite coal or charcoal in a mixed air steam blast

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