Heat Transfer
Grashoff number, which is defined as g . β(Ts - T∞) ρ². L³/μ², is proportional to the ratio of buoyancy force to __________ force.

Inertial
Elastic
None of these
Viscous

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Heat Transfer
Fouling factor

Is a dimensionless quantity
Does not provide a safety factor for design
None of these
Accounts for additional resistances to heat flow

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