Heat and Mass Transfer
The thermal diffusivities for solids are generally

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

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Heat and Mass Transfer
Which of the following would lead to a reduction in thermal resistance?

In convection, stirring of the fluid and cleaning the heating surface.
In radiation, increasing the temperature and reducing the emissivity.
In conduction, reduction in the thickness of the material and an increase in thermal conductivity.
All of these

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