| The laws list: O |
The laws list O
Occam's razor to Olbers' paradox.
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O.
- Occam's [or Ockham's] razor (William of
Occam [or Ockham]; c. 1340)
-
- The suggestion that the simpler a theory is,
the better. If two theories predict phenomena to the same accuracy, then the
one which is simpler is the better one. Moreover, additional aspects of a
theory which do not lend it more powerful predicting ability are unnecessary
and should be stripped away.
-
- ohm; Omega; O (after G. Ohm, 1787-1854)
-
- The derived
SI unit of
electric resistance, defined as the resistance between two points on a
conductor when a constant potential difference of 1
V produces
a current of 1
A in the
conductor; it thus has units of
V/A.
-
- Ohm's law (G. Ohm; 1827)
-
- The ratio of the potential difference between the
ends of a conductor to the current flowing through it is constant; the
constant of proportionality is called the resistance, and is different for
different materials.
-
- Olbers' paradox (H. Olbers; 1826)
-
- If the Universe is infinite, uniform, and
unchanging then the entire sky at night would be bright -- about as bright
as the Sun. The further you looked out into space, the more stars there
would be, and thus in any direction in which you looked your line-of-sight
would eventually impinge upon a star. The paradox is resolved by the big
bang theory, which puts forth that the Universe is non-uniform, dynamic, and
(probably) finite.
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