Engineering Thermodynamics
According to Avogadro's law, for a given pressure and temperature, each molecule of a gas

Occupies volume proportional to its specific weight
Occupies volume inversely proportional to its molecular weight
Occupies volume inversely proportional to its specific weight
Occupies same volume

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Engineering Thermodynamics
Carbonization of coal consists of

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

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