Define in fine terms A Spherical Drop of Water
The elementary charge, usually denoted by e, is a fundamental physical constant, defined as the electric charge carried by a single proton (+1 e) or, equivalently, the magnitude of the negative electric charge carried by a single electron, which has charge −1 e.[2][a]
In SI units, the coulomb is defined such that the value of the elementary charge is
The coulomb was previously defined
in terms of the ampere
based on
the force
between
two wires,
as 1 A × 1 s.[4]
The 2019 redefinition of the ampere and other SI base units fixed the numerical value of the elementary charge when expressed in coulombs and therefore fixed the value of the coulomb when expressed as a multiple of the fundamental charge.
exactly
e
= 1.602176634×10−19 C[1]
.0000000000000000001602
0.0000000000000000001602
The coulomb (symbol: C) is the unit of electric charge
in the International System of Units (SI).[1][2]
It is defined to be equal to
the electric charge delivered by a 1 ampere
current
in 1 second,
with the elementary charge e
as a defining constant
The ampere (/ˈæmpɛər/ ⓘ AM-pair, US: /ˈæmpɪər/ ⓘ AM-peer;[1][2][3] symbol: A),[4] often shortened to amp,[5] is the unit of electric current in the International System of Units (SI). One ampere is equal to 1 coulomb (C) moving past a point per second.[6][7][8] It is named after French mathematician and physicist André-Marie Ampère (1775–1836), considered the father of electromagnetism along with Danish physicist Hans Christian Ørsted.
An electric current is a flow
of charged particles, aka, as electrons or ions,
moving through an electrical conductor
in any of the four states crystalic/plasmic/mol atomic/atomic.
It is defined as the net rate of flow of electric charge
through a surface.[1]: 2 [2]: 622
Surface being defined by
edges
edges defninig
form
forming
volume
The moving nodes are called charge carriers,
which may be one of several types of nodes,
depending on the conductor.
In electric circuits the charge carriers
are often electrons appearing to move through a wire.
as the lattice structure is constantly
forming and re forming
its self
fluidly
at
s
o
m
e
u
ni
q
ue
Rate
Radius
Ratio
In semiconductors they can be electrons
In an electrolyte the charge carriers are ions,
while in plasma, aka an ionized gas, they are ions and electrons.[3]
In physics, a charged node is an it~icle with an electric charge.
elementary charges, like the electron. Have/Are electric charge.
Some composite charges like protons Have/Are charge nodes
Any ion,
such as any molecule or any atom
with any surplus or any deficit
of electrons
relative
to protons
are also
charged nodes.
As of the 2019 revision of the SI, the ampere is re defined
by fixing the elementary charge e to be exactly 1.602176634×10−19 C,[6][9]
which means
an ampere is an electric current equivalent to 1019 elementary charges
moving every 1.602176634 seconds,
or
approximately 6.241509074×1018 elementary charges moving in a second.
Prior to the redefinition:
the ampere was defined as
the current passing through
two parallel wires 1 metre apart
producing a magnetic force
of 2×10−7 newtons per metre.
A newton is defined as 1 kg⋅m/s2 (it is a named derived unit defined in terms of the SI base units).[1]: 137 One newton is, therefore, the force needed to accelerate one kilogram of mass at the rate of one metre per second squared in the direction of the applied force.[2]
The units "metre per second squared" can be understood as measuring a rate of change in velocity per unit of time, i.e. an increase in velocity by one metre per second every second.[2]
In 1946, the General Conference on Weights and Measures (CGPM) Resolution 2 standardized the unit of force in the MKS system of units to be the amount needed to accelerate one kilogram of mass at the rate of one metre per second squared. In 1948, the 9th CGPM Resolution 7 adopted the name newton for this force.[3] The MKS system then became the blueprint for today's SI system of units.[4] The newton thus became the standard unit of force in the Système international d'unités (SI), or International System of Units.[3]
The earlier CGS system has two units of current, one structured similarly to the SI's and the other using Coulomb's law as a fundamental relationship, with the CGS unit of charge defined by measuring the force between two charged metal plates. The CGS unit of current is then defined as one unit of charge per second.[10]
The newton is named after Isaac Newton. As with every SI unit named after a person, its symbol starts with an upper case letter (N), but when written in full, it follows the rules for capitalisation of a common noun; i.e., newton becomes capitalised at the beginning of a sentence and in titles but is otherwise in lower case.
The connection to Newton comes from Newton's second law of motion, which states that the force exerted on an object is directly proportional to the acceleration hence acquired by that object, thus:[5]where represents the mass of the object undergoing an acceleration . When using the SI unit of mass, the kilogram (kg), and SI units for distance metre (m), and time, second (s) we arrive at the SI definition of the newton: 1 kg⋅m/s2.
Electron bound in an atom
Absorption:
An electron in an atom can absorb
a photon if the photon's energy
precisely matches
the energy difference
between the electron's
current energy level (orbital)
and a higher,
unoccupied orbital.
If the energy doesn't match,
the photon will
pass through the atom without interaction.
This is observed as a
specific frequency
The Frequency can be
resonated with a tuning fork.
- Emission:
An excited electron
one that has absorbed a photon
and moved to a higher energy level
is unstable.
It will eventually fall back
to a lower energy level,
emitting a photon
in the process.
The energy of the emitted photon
equals the difference in energy
between the initial (higher)
and final (lower)
energy levels
of the electron.
The Energy Levels of
the electron are determined
by the valence shell
occupied
and Valence shell occupants
If a photon has enough energy
In the centimetre–gram–second system of units (CGS), the corresponding quantity is 4.8032047...×10−10 statcoulombs.[b]
Robert A. Millikan and Harvey Fletcher's oil drop experiment first directly measured the magnitude of the elementary charge in 1909, differing from the modern accepted value by just 0.6%.[4][5] Under assumptions of the then-disputed atomic theory, the elementary charge had also been indirectly inferred to ~3% accuracy from blackbody spectra by Max Planck in 1901[6] and (through the Faraday constant) at order-of-magnitude accuracy by Johann Loschmidt's measurement of the Avogadro constant in 1865.
- The number of molecules is .
- Avogadro's number () is approximatelymolecules per mole.
- The molar mass of water () is approximately.
- Assuming the density of water is .
- The pH is given as 9.5.
- The concentration of hydroxide ions is .
- The concentration of hydronium ions is .
- The concentration of excess hydroxide ions is .
- Water acts as both an acid and a base: Water is an amphoteric substance, meaning it can both donate and accept a proton (H⁺).
- Proton transfer: In autoionization, one water molecule donates a proton to another water molecule.
- Formation of H₃O⁺ and OH⁻: This transfer of a proton results in the formation of a hydronium ion (H₃O⁺) and a hydroxide ion (OH⁻).
- H₂O (water, acting as a base) + H⁺ (from another water molecule) → H₃O⁺ (hydronium ion)
- H₂O (water, acting as an acid) - H⁺ → OH⁻ (hydroxide ion)
- The overall reaction is represented as: 2H₂O ⇌ H₃O⁺ + OH⁻.
- This process is in dynamic equilibrium, meaning that water molecules are constantly dissociating into H₃O⁺ and OH⁻ ions, while at the same time, H₃O⁺ and OH⁻ ions are recombining to form water molecules.
- At 25°C, in pure water, the concentrations of both H₃O⁺ and OH⁻ ions are equal and are approximately 1.0 x 10⁻⁷ M. This corresponds to a neutral pH of 7.
- The most common way to increase the concentration of H₃O⁺ in water (beyond autoionization) is to add an acid.
- According to the Brønsted-Lowry definition, an acid is a proton donor. When an acid is added to water, it donates a proton (H⁺) to a water molecule. According to Khan Academy This proton immediately combines with a water molecule, using one of the lone pairs of electrons on the oxygen atom, forming H₃O⁺.
- Strong Acids: Strong acids, like hydrochloric acid (), sulfuric acid (), and nitric acid (), completely dissociate (or ionize) in water, meaning they donate almost all of their protons to water molecules, dramatically increasing the H₃O⁺ concentration.
- Weak Acids: Weak acids, such as acetic acid (), only partially dissociate in water. They establish an equilibrium where only a fraction of their molecules donate protons to water, forming H₃O⁺.
- Peak amplitude (),
- Peak-to-peak amplitude (),
- Root mean square amplitude (),
- Wave period = 1 (Amplitude) X 2 X π
- Ψιρψθμφερενψε




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