Formulas
- Star height
- Reaction calorimeter
- Real interest rate
- Reciprocity (electromagnetism)
- Red–black tree
- Reflection phase change
- Reilly formula
- Relative permittivity
- Thermal conduction
- Twelvefold way
- Wigner–Weyl transform
- Diamagnetism
- Differentiable curve
- Differentiable manifold
- Diffuse reflectance spectroscopy