A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Power
The rate at which
work is done, or energy expended, per unit time.
Poynting
Vector
It is the energy per unit area per unit
time transported by electromagnetic field.
Poynting’s
Theorem
According to the
theorem, the work done on charges by electromagnetic field is equal to decrease
in energy stored in field less the energy that flowed out through the surface.
Precession
of Equinoxes
The precessional
motion of earth’s axis causes a change in direction of line of equinoxes which
is called precession of equinoxes.
Precipitation
Hardening
Hardening and strengthening of a metal
alloy by extremely small and uniformly dispersed particles that precipitate
from a supersaturated solid solution is called as precipitation hardening.
Pressure
Law
At constant
volume, the pressure of a given mass of a gas increases (or decreases) by (1/273)th
of its pressure at 0 oC on increasing (or decreasing) its
temperature by 1oC.
Pressure
Transducer
It is an electronic device that converts
pressure into electrical signals that can be recorded digitally.
Pressure
Pressure on any surface is defined as normal
force per unit area of surface.
Prevost’s
Theory of Heat Exchange
Each body emits thermal radiation at all
temperatures, but for absolute zero; and it absorbs radiations emitted from all
other bodies in its surroundings.
Primary
Bonds
Inter atomic
bonds that are relatively strong and for which bonding energies are relatively
large. Primary bonding types are ionic, covalent, and metallic.
Primary
Colors
Almost all
visible colors can be obtained by the additive color mixing of three colors that are in widely spaced regions of the visible
spectrum. If the three colors of light can be mixed to produce white, they are called
primary colors and the standard additive primary colors are red, green and
blue.
Principal
Points
The principal points are a pair of conjugate
points on the principal axis for which linear magnification is unity and
positive.
Principle
of Calorimeter
If no heat is
lost to surroundings, the heat lost by hot body must be equal to heat gained by
cold body.
Principle
of Calorimetry
When hot body and cold body are joined
together, they attain common temperature and heat lost by hot body is equal to
heat gained by cold body provided there is no loss of heat to surroundings by
conduction, convection or radiation.
Principle
of Degradation of Energy
All the available energy of universe is
tending towards zero i.e., entropy is reaching its maximum value.
Principle
of Equal Apriori Probability
According to this
principle, the probability of finding the phase point for given system in any
region of phase space is identical with that for any other region of equal
extension or volume.
Principle
of Equivalence
In the
neighborhood of any given point it is not possible to distinguish between the
gravitational field produced by the attraction of masses and the field produced
by accelerating a inertial frame of reference.
Principle
of Homogeneity of Dimensions
The principle
states that physical quantities of same dimensions only can be added or
subtracted or equated.
Principle
of Invariance of Charge
According to this principle, the total
charge in an isolated system is unchanged by motion of its charge carriers.
or
The total electric charge of an isolated
system is relativistically invariant.
Principle
of Least Time
Same as Fermat’s
principle of extremum path.
Principle
of Regenerative Cooling
Regenerative
cooling is a method of cooling gases in
which compressed gas is cooled by allowing it to expand and thereby taking heat
from the surroundings, the cooled expanded gas then passes through a heat exchanger where it cools the incoming
compressed gas.
Principle
of Reversibility
If all velocities
in a dynamical system are reversed, the whole previous motion has to be
obtained provided there is no dissipation.
Principle
Quantum Number
It is one of four
quantum numbers associated with energy levels in an atom. The principle quantum
number has integer values 1, 2, 3……. corresponding
to order of orbit containing electrons.
Prism
It is a
homogenous, transparent medium (such as glass) enclosed by two refracting plane
surfaces at an angle.
Probability
Density Function
The outcome of a
repeatable experiment, usually referred to as a random variable, is not always
discrete and usually can take any value within a continuous range. If ‘x’ is
continuous then the probability that the outcome lies between x and x+dx can be
written as P(x)=f(x;θ)dx. Here f(x, θ) is called the probability density
function.
Process
A process is the
path along which a change of state takes place. The process can occur under
variety of conditions which must be defined because many things depend on
nature of process. For a substance, isothermal, isochoric, adiabatic, cyclic
etc are examples of process.
Progressive
Wave Motion
Wave motion in
which there is no transfer of medium in direction of propagation wave, but
there is always transfer of energy in the direction of propagation of wave.
Progressive
Wave
If we produce
waves continuously in a medium, at any instant, all the particles of medium
start vibrating in same manner, but different particles are in different states
of their vibrations. The disturbance or wave so produced in the medium is
called progressive wave.
Projectile
A body projected
with certain velocity making an angle other than 90o to the
horizontal is known as projectile.
Prompt Neutron
Neutrons released in fission within 10-14 sec or less.
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