(Encyclopedia) electroweak theory, a unified field theory that describes two of the fundamental forces in nature, electromagnetism (see electromagnetic radiation) and the weak interaction. The…
(Encyclopedia) elegy, in Greek and Roman poetry, a poem written in elegiac verse (i.e., couplets consisting of a hexameter line followed by a pentameter line). The form dates back to 7th cent. b.c.…
(Encyclopedia)
CE5
element, in chemistry, a substance that cannot be decomposed into simpler substances by chemical means. A substance such as a compound can be decomposed into its constituent…
(Encyclopedia)
CE5
elementary particles, the most basic physical constituents of the universe.
The first subatomic particle to be discovered was the electron, identified in 1897 by J. J.…
(Encyclopedia)
Elementary Particles
Leptons
Particle
Symbol
Mass (MeV/c2)
Electric Charge
electron
e−
0.511
−1
muon
μ-
105.7
−1
tau
τ
1784.1
−1
electron neutrino
νe
<7.3×10−6
0
muon…
(Encyclopedia) Alston, Walter Emmons, 1911–84, American baseball manager, b. Venice, Ohio. Nicknamed Smokey, he played one major-league game, for the St. Louis Cardinals in 1936, and struck out in…
(Encyclopedia) Elements
Element
Symbol
Atomic Number
Atomic Weight1
Melting Point
(Degrees Celsius)
Boiling Point
(Degrees Celsius)
actinium
Ac
89
(227)
1050.
3200. ±300
aluminum
Al
13
26.…
