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What is chemical potential ?

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Chemical potential is the change in the Gibbs free energy of a system when one mole of a substance is added at constant temperature and pressure.                     μ=(∂G/∂n)ₜ,ₚ where G is Gibbs free energy and n is the number of moles. ● Chemical potential represents the driving.     force for the movement of particles. ☆  Particles naturally move from higher.             chemical potential to lower  chemical potential. ☆  At equilibrium, the chemical potential is.       the  same throughout the system.
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Why is space dark?

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Even though billions of stars emit light, space appears dark because most of the universe is empty.Light travels in straight lines and doesn’t illuminate empty space unless it interacts with matter. So, between stars and galaxies, there is very little material to scatter the light toward our eyes.
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polarizability of H-atom.

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The polarizability of a hydrogen atom describes how easily it's electron cloud can be distorted by an external electric field.
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Rank of the tensor

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The rank of the tensor is the number of suffixes or indices(without counting an index which appears once as a subscript) in the symbol representing tensor.
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polaroids.

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It is a device which is used to produce the plane polarised light. It is based on the principle of selective absorption and more effective than the tourmaline crystal. Polaroid allows the light oscillations parallel to the transmission axis to pass through them. The crystal or polaroid on which the unpolarised light is incident is called polariser. Crystal or polaroid on which polarised light is incident is called analyser.
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angle of contact.

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It is defined as the angle between the tangent to the liquid surface at the point of contact and solid surface inside the liquid is called as angle of contact  The value of angle of contact depends upon  (i) Nature of solid and liquid in contact  (ii) Cleanliness of the surface in contact  (iii) Medium above the free surface of liquid 
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Elastic hysteresis.

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The loop formed by loading and unloading the wire is called hysteresis loop.
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