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2. List of formulae involving π - Wikipedia

   en.wikipedia.org/wiki/List_of_formulae_involving_π

   where C is the circumference of a circle, d is the diameter, and r is the radius. More generally, = where L and w are, respectively, the perimeter and the width of any curve of constant width. = where A is the area of a circle. More generally, =

3. Proton radius puzzle - Wikipedia

   en.wikipedia.org/wiki/Proton_radius_puzzle

   The proton radius puzzle is an unanswered problem in physics relating to the size of the proton. [1] Historically the proton charge radius was measured by two independent methods, which converged to a value of about 0.877 femtometres (1 fm = 10 −15 m).

4. List of experiments in physics - Wikipedia

   en.wikipedia.org/wiki/List_of_experiments_in_physics

   Pictet's experiment: Marc-Auguste Pictet: Demonstration Thermal radiation: 1797 Cavendish experiment: Henry Cavendish: Measurement Gravitational constant: 1799 Voltaic pile: Alessandro Volta: Demonstration First electric battery: 1803 Young's interference experiment: Thomas Young: Confirmation Wave theory of light: 1819 Arago spot experiment ...

5. Diameter - Wikipedia

   en.wikipedia.org/wiki/Diameter

   The diameter of a set is the least upper bound of the set of all distances between pairs of points in the subset. A different and incompatible definition is sometimes used for the diameter of a conic section: any chord which passes through the conic's centre. A diameter of an ellipse is any line passing through the centre of the ellipse. [2]

6. Glossary of physics - Wikipedia

   en.wikipedia.org/wiki/Glossary_of_physics

   physical quantity physics The natural science that involves the study of matter and its motion through space and time, along with related concepts such as energy and force. More broadly, it is the general analysis of nature, conducted in order to understand how the universe behaves. piezoelectricity pion Planck constant ()

7. Diameter (disambiguation) - Wikipedia

   en.wikipedia.org/wiki/Diameter_(disambiguation)

   Diameter (graph theory), the longest distance between two vertices of a graph; Diameter (group theory), the maximum diameter of a Cayley graph of the group; Equivalent diameter, the diameter of a circle or sphere with the same area, perimeter, or volume as another object; Kinetic diameter, a measure of particles in a gas related to the mean ...

8. Magdeburg hemispheres - Wikipedia

   en.wikipedia.org/wiki/Magdeburg_hemispheres

   The experiment became a popular way to illustrate the principles of air pressure, and many smaller copies of the hemispheres were made, and are used to this day in science classes. Reenactments of von Guericke's experiment of 1654 are performed in locations around the world by the Otto von Guericke Society.

9. Experimental physics - Wikipedia

   en.wikipedia.org/wiki/Experimental_physics

   Experimental physics is the category of disciplines and sub-disciplines in the field of physics that are concerned with the observation of physical phenomena and experiments. Methods vary from discipline to discipline, from simple experiments and observations, such as Galileo's experiments , to more complicated ones, such as the Large Hadron ...