Physics.ie - Focus on Physics

Glossary M

Mach’s Principle

The inertia of any system is the result
of the interaction of that system and the rest of the universe.
In other words, every particle in the universe ultimately has
an effect on every other particle. Named after Ernst Mach in 1893.
Magnetopause
The boundary of the magnetosphere, separating
plasma attached to Earth from the one flowing with the solar wind.
Magnetic Resonance Imaging (MRI)
An imaging technique based on the principles
of Nuclear Magnetic Resonance. Uses positrons to trace the
structure of the brain using radioactive dyes injected into the patient.
Maxwell’s Equations
Maxwell’s equations are the set of four
equations by James Clerk Maxwell that describe the behavior of
both the electric and magnetic fields. Maxwell’s equations provided
the basis for the unification of electric field and magnetic field,
the electromagnetic description of light, and ultimately, Albert
Einstein’s theory of relativity. [more]
Meson
A hadron made from an even number of
quark-antiquark constituents. The basic structure of most meson
is one quark and one antiquark. These particles are not fundamental.
Muon
Is a collective name for two semistable fundamental particles with
positive and negative charge. Muons have a mass that is 207 times
greater than the electron (105.6 MeV) and a spin of 1/2. Both electrons
and muons belong to to the same family of fermions called the leptons.
Because of this, a negatively-charged muon can be thought of as an
extremely heavy electron. Muons are denoted by µ- and µ+ depending
on their charge.
Skip to toolbar