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Radiation pressure
Radiation pressure is the pressure exerted by light.
Raman effect
The Raman effect is a quantum effect observed when light ...
Raman spectroscopy
Raman spectroscopy is mainly used in chemistry and ...
Recombination
The term "recombination" is used in various fields ...
Reflection microscope
The reflection microscope is an optical microscope for ...
Refraction
Refraction is the deviation of a ray at the surface of a ...
Refractive index
In an isotropic medium the refractive index at a point is ...
Refractory
Refractory materials are materials that withstand high ...
Refringence
Refringence is the property of refracting a light beam.
Reionisation
Reionisation occurred in an early period in the history of ...
Relative density
Relative density is the mass of a body divided by the mass ...
Resistivity
ELECTRICITY The resistivity of a conducting substance is ...
Resonance
Resonance is a method for mathematically describing the ...
Rheology
Rheology is a branch of mechanics dealing with the relations ...
Rigidity
Rigidity is the ability of a solid to withstand deformation ...
Rolling mill
A rolling mill is a machine to produce metal products by ...
Rydberg atom
The Rydberg atom is a highly excited atom with one or more ...