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
Stiffness
Constant
Any one of the coefficients of the
relations in the generalized Hooke's law used to express stress components as
linear functions of the strain components.
Stimulated
Emission (LASER)
If in the excited
state of the atom, a photon of frequency same as the frequency of photon which
the atom in passing from the excited state to the ground state will emit,
strikes the atom, then that atom come to ground state very soon and stimulates
the light incident on it, by emitting photon of exactly the same frequency.
This is called stimulated emission.
Stochastic
Process
Stochastic process
appears in probability theory, a process involving the operation of chance. For example, in radioactive decay every atom is subject to a fixed probability of breaking down in
any given time interval. More generally, a stochastic process refers to a
family of random
variables indexed against some other
variable or set of variables.
Stoichometry
The word
stoichometry derives from two Greek words: Stoicheion (meaning
"element") and Metron (meaning "measure"). Stoichometry
deals with calculations about the masses (sometimes volumes) of reactants and
products involved in a chemical reaction. It is a very mathematical part of
chemistry. The rules for determining stoichometric relationships are based on
the laws of conservation of mass and energy and the law of combining weights or
volumes.
Stokes
Lines
The smaller
frequency component in Raman spectrum are called stokes lines.
Stopping
Power
The
ratio of differential energy loss within the absorber to the corresponding
differential path length for a charged particle is called stopping power.
or
Stopping
power or linear energy transfer (LET) is the energy lost per unit path length.
STP
(Standard Temperature Pressure)
STP is commonly used to define standard
conditions for temperature and pressure which is important for measurements of
chemical and physical processes. As per IUPAC (International Union of Pure and
Applied Chemistry), it is defined as
air at 0 oC and 105 Pascals. STP in imperial and USA
system of units is defined as air at 60oF and 14.696 Psi.
Straggling
Energy lost by
identical charged particles passing through a medium is statistical in nature
if the medium is inhomogeneous in nature, this would lead to variation in
“range” of same energetic incident particles in that medium. This is called
straggling.
Strain
(Engineering)
The change in gauge length of a specimen
(in the direction of an applied stress) divided by its original gauge length.
Strain
Energy
When a body is
deformed, the work done is stored in the form of potential energy in the body.
This potential energy is called strain energy.
Strange
Particles
Kaons (K-mesons)
and Hyperons are known as strange particles. They are produced in strong
interactions but they decay slowly and are hence called as strange particles.
Stratopause
The boundary between the stratosphere and
the mesosphere is called the stratopause.
Stratosphere
The stratosphere is a layer of Earth's
atmosphere. The stratosphere is the second layer, as one move upward from
Earth's surface, of the atmosphere.
The stratosphere is above the troposphere and
below the mesosphere. The top of the stratosphere occurs at 50 km (31 miles)
altitude.
Stream
Line Flow
It
is the path of liquid such that tangent to which at any point gives the
direction of flow of liquid at real point.
or
When
a liquid flows such that each particle of liquid passing a point moves along
the same path and has some velocity as preceding particle, its flow is called
streamline flow.
Stress
Restoring force
per unit area.
Strong
Interaction
Interaction which
exists between nucleons and holds them is called as strong interaction. This
interaction overcomes Coulomb’s force. It has short range of order of 10-13
cm. It holds quarks together in the Proton and Neutron and also holds protons
and neutrons together in nucleus of an atom. The strong interaction force is
carried by spin -1 particle called Gluon which interacts only with itself and
with quarks.
Strong
Nuclear Force
The force which holds nucleus together. It has short range of order 10-13 cm. It holds quarks together in the proton and neutron and also holds protons and neutrons together in nucleus of an atom. It is believed that this force is carried by another spin -1 particle called Gluon which interacts only with itself and with the quarks.
No comments:
Post a Comment