What is the physical significance of the Lewis number? How is it defined? What does a Lewis number of 1 indicate?
What will be an ideal response?
The dimensionless Lewis number is defined as the ratio of thermal diffusivity to mass diffusivity 
, and it represents the relative magnitudes of heat and mass diffusion at molecular level in the thermal and concentration boundary layers, respectively. A Lewis number of unity indicates that heat and mass diffuse at the same rate, and the thermal and concentration boundary layers coincide.
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Fill in the blank(s) with the appropriate word(s).
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Answer the following statement true (T) or false (F)