Chemistry
In a reaction of the type A+B ? C+D one could ensure it to be a first order reaction by :

Increasing the concentration of a reactant
Increasing the concentration of a product
Increasing the temperature
Adding a catalyst

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

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

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