A hot object suspended by a string is to be cooled by natural convection in fluids whose

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A hot object suspended by a string is to be cooled by natural convection in fluids whose volume changes differently with temperature at constant pressure. In which fluid will the rate of cooling be lowest? With increasing temperature, a fluid whose volume
(a) Increases a lot

(b) Increases slightly

(c) Does not change

(d) Decreases slightly

(e) Decreases a lot.

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