*$_Minimum porosity for fluidisation is?

1.	*$_Minimum porosity for fluidisation is?
A.	That corresponding to static bed
B.	That corresponding to completely fluidised bed
C.	The porosity of the bed when true fluidisation begins
D.	Less than that of the' static bed
Answer» D. Less than that of the' static bed

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*$_Minimum porosity for fluidisation is?

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