Chemistry
The number of water molecules present in a drop of water (volume 0.0018 ml) at room temperature is

6.023 x 1019
1.568 x 103
6.023 x 1023
4.84 x 1017

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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
Accumulation of smoke and dust over the sigrees
Lack of oxygen in the surroundings of sigrees

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