Chemical Engineering Basics
In radiative heat transfer, a grey surface is the one, which has

Zero reflectivity
Grey appearance to the eye
Emissivity independent of wavelength
Equal brightness in all directions

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Chemical Engineering Basics
The emf of a Deniell cell Zn | Zn²⁺ || Cu²⁺ | Cu can be increased by

Increasing the concentration of copper sulphate solution
Increasing the concentration of zinc sulphate solution
Decreasing the surface area of the electrodes
Increasing the surface area of the electrodes

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