Engineering Thermodynamics
The condition of perfect vacuum, i.e., absolute zero pressure can be attained at

A negative pressure and 0°C temperature
A temperature of - 273.16°C
A temperature of 273 °K
A temperature of 0°C

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Engineering Thermodynamics
Producer gas is obtained by

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

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