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In Appollo space programme the fuel cell...

In Appollo space programme the fuel cells are used not only for electric power but also for prepare `H_2 O` for drinking. What do-you understand by a fuel cell? What are the advantages of fuel cells over ordinary cells?

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i. A fuel cell is a device,which canconvert a portion of free eniergy change into electrical energy. The fuel used are `H_y, CH_f, CO` etc. The common fuetcell is `H_1^1,-O_3` fuel cell. ii. It is a more efficient method of generating energy and it does not cause pollution.
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