| The laws list: G |
The laws list G
G to gravitational radius.
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G.
- Gaia hypothesis (J. Lovelock, 1969)
-
- The idea that the Earth as a whole should be
regarded as a living organism and that biological processes stabilize the
environment.
-
- Gauss' law (K.F. Gauss)
-
- The electric flux through a closed surface is
proportional to the algebraic sum of electric charges contained within that
closed surface; in differential form,
div E = rho,
where rho is the charge density.
-
- Gauss' law for magnetic
fields (K.F. Gauss)
-
- The magnetic flux through a
closed surface is zero; no magnetic charges exist; in differential form,
div B = 0.
- geometrized units
-
- A system of units whereby certain
fundamental constants (G,
c,
k, and
h)
are set to unity. This makes calculations in certain theories, such as
general relativity, much easier to deal with, since these constants appear
frequently.
As a result of converting to geometrized units, all quantities are
expressed in terms of a unit of distance, traditionally the
cm.
-
- grandfather paradox
-
- A paradox proposed to discount time travel
and show why it violates causality. Say that your grandfather builds a time
machine. In the present, you use his time machine to go back in time a few
decades to a point before he married his wife (your grandmother). You meet
him to talk about things, and an argument ensues (presumably he doesn't
believe that you're his grandson/granddaughter), and you accidentally kill
him.
If he died before he met your grandmother
and never had children, then your parents could certainly never have met
(one of them didn't exist!) and could never have given birth to you. In
addition, if he didn't live to build his time machine, what are you doing
here in the past alive and with a time machine, if you were never born and
it was never built?
-
- gray; Gy (after L.H. Gray, 1905-1965)
-
- The derived
SI unit of
absorbed dose, defined as the absorbed dose in which the energy per unit
mass imparted to the matter by ionizing radiation is 1
J/kg;
it thus has units of
J/kg.
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