Heat and Mass Transfer
The thermal diffusivities for solids are generally

More than those for liquids and gases
More or less same as for liquids and gases
Less than those for gases
Less than those for liquids

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Heat and Mass Transfer
Film coefficient is defined as the ratio of

Thickness of film of fluid to the thermal conductivity
Thickness of film of fluid to the temperature drop through the films of fluids
Temperature drop through the films of fluids to the thickness of film of fluids
Thermal conductivity to the equivalent thickness of the film of fluid

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