Engineering Thermodynamics
A definite area or a space where some thermodynamic process takes place is known as

Thermodynamic law
Thermodynamic system
Thermodynamic cycle
Thermodynamic process

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Engineering Thermodynamics
An open system is one in which

Mass crosses the boundary but not the energy
Mass does not cross boundaries of the system, though energy may do so
Neither mass nor energy crosses the boundaries of the system
Both energy and mass cross the boundaries of the system

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Engineering Thermodynamics
Producer gas is obtained by

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

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