Engineering Thermodynamics
For a perfect gas, according to Boyle’s law (where P = Absolute pressure, V = Volume and T = Absolute temperature)

P v = constant, if T is kept constant
P/T = constant, if v is kept constant
T/P = constant, if v is kept constant
V/T = constant, if p is kept constant

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Engineering Thermodynamics
Carbonization of coal consists of

Moulding the finely ground coal under pressure with or without a binding material
Heating the wood with a limited supply of air to temperature not less than 280°C
Drying and crushing the coal to a fine powder
None of these

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