Engineering Materials
The molecules in a solid move

Back and forth like tiny pendulums
In circular motion
In a random manner
In a haphazard way

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Engineering Materials
The brown smoke during the operation of a Bessemer converter indicates that the

Silicon and manganese has burnt and carbon has started oxidizing
The converter must be titled to remove the contents of the converter
Air is burning out silicon and manganese
The brown smoke does not occur during the operation of a Bessemer converter

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