Chemistry
In arc welding, Argon is used because of its

Ability to lower the melting point of the metal
High calorific value
High flammability
Low reactivity with metal

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Chemistry
The open "Sigrees" or coal stoves often require fanning to sustain burning because of

Interrupted release of moisture from the material
Tendency of carbon dioxide to form a layer along with dust smoke
Lack of oxygen in the surroundings of sigrees
Accumulation of smoke and dust over the sigrees

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