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Hello sir

Sir if matter is a technical term for protons nuetrons and electrons and objects made up of them , then why have not defined matter as technical term for protons neutrons and electronand objects made up of them, why the scientists have defined matter as anything which had mass and which occupies space


Let me present an analogy.  If we define birds as living animals with feathers, beaks, and wings, why do we have names for individual kinds of birds.  Swans, gees, swallows, penguins, and so on.

Matter is a category, electrons, protons, neutrons, neutrinos, muons, tauons, quarks are all matter but they have different properties which distinguish them.  Consequently they have different names.  This is not profound, it is the way humans categorize things.  I would rather say "electron" than "matter which has a mass of 9.10938356 10-31 kilograms, and a charge of negative 1.60217662 10-19 coulombs".  The name categorizes a thing and tells up quickly whatit's properties are.

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Carlo Segre


I can answer most questions about studying physics in college and graduate school; questions about condensed matter physics; x-ray physics; synchrotron radiation; and general and modern physics. I can also answer questions about careers in academia.


Professor of physics for 30 years at Illinois Institute of Technology. Academic adviser for undergraduates and graduate students. I have served on university promotion and tenure committees, search committees for Deans and Department Chairs. I have also been an Associate Department Chair and an Associate Dean. I have 34 years experience in materials science research and I have been responsible for building and now managing a User facility at the Advanced Photon Source.

American Physical Society
Sigma Xi
American Chemical Society
American Associate for the Advancement of Science
International Centre for Diffraction Data (Fellow)
International X-ray Absorption Society

Nature; Physical Review Letters; Physical Review; Applied Physics Letters; Journal of Physical Chemistry; Journal of Magnetism and Magnetic Materials; Physical Chemistry Chemical Physics; Solid State Communications; Physics Letters; Journal of Low Temperature Physics; Journal of Crystal Growth and Design; Physics Letters; Journal of Applied Physics; Journal of Archaeological Science; Physica C; Corrosion Science; Electrochimica Acta; Journal of Nuclear Materials

Ph.D. Physics, 1981 - University of California, San Diego
M.S. Physics, 1977 - University of California, San Diego
B.S. Physics, 1976 - University of illinois, Champaign-Urbana
B.S. Chemistry 1976 - University of illinois, Champaign-Urbana

Awards and Honors
Duchossois Leadership Professor of Physics, IIT Fellow, International Center for Diffraction Data

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