ββPoynting Vector
In physics, the Poynting vector (or UmovβPoynting vector) represents the directional energy flux (the energy transfer per unit area, per unit time) or power flow of an electromagnetic field. The SI unit of the Poynting vector is the watt per square metre (W/m2); kg/s3 in base SI units. It is named after its discoverer John Henry Poynting who first derived it in 1884.β Nikolay Umov is also credited with formulating the concept. Oliver Heaviside also discovered it independently in the more general form that recognises the freedom of adding the curl of an arbitrary vector field to the definition. The Poynting vector is used throughout electromagnetics in conjunction with Poynting's theorem, the continuity equation expressing conservation of electromagnetic energy, to calculate the power flow in electromagnetic fields.
βββββββββββ
β’ @Physics β‘
In physics, the Poynting vector (or UmovβPoynting vector) represents the directional energy flux (the energy transfer per unit area, per unit time) or power flow of an electromagnetic field. The SI unit of the Poynting vector is the watt per square metre (W/m2); kg/s3 in base SI units. It is named after its discoverer John Henry Poynting who first derived it in 1884.β Nikolay Umov is also credited with formulating the concept. Oliver Heaviside also discovered it independently in the more general form that recognises the freedom of adding the curl of an arbitrary vector field to the definition. The Poynting vector is used throughout electromagnetics in conjunction with Poynting's theorem, the continuity equation expressing conservation of electromagnetic energy, to calculate the power flow in electromagnetic fields.
βββββββββββ
β’ @Physics β‘
π26β€10π₯4π€©4
ββUltrasound-activated inks could print 3D structures inside the human body.
β Source : Click here
βββββββββββ
β’ @Physics β‘
β Source : Click here
βββββββββββ
β’ @Physics β‘
π₯12π3π1π€©1
ββA thermal transistor that uses an electric field to control the flow of heat could cool computer chips or even reveal how living cells regulate heat at the molecular level.
β Source : Click here
βββββββββββ
β’ @Physics β‘
β Source : Click here
βββββββββββ
β’ @Physics β‘
β€12π₯9π8
ββPermittivity
In electromagnetism, the absolute permittivity, often simply called permittivity and denoted by the Greek letter Ξ΅ (epsilon), is a measure of the electric polarizability of a dielectric. A material with high permittivity polarizes more in response to an applied electric field than a material with low permittivity, thereby storing more energy in the material. In electrostatics, the permittivity plays an important role in determining the capacitance of a capacitor.
βββββββββββ
β’ @Physics β‘
In electromagnetism, the absolute permittivity, often simply called permittivity and denoted by the Greek letter Ξ΅ (epsilon), is a measure of the electric polarizability of a dielectric. A material with high permittivity polarizes more in response to an applied electric field than a material with low permittivity, thereby storing more energy in the material. In electrostatics, the permittivity plays an important role in determining the capacitance of a capacitor.
βββββββββββ
β’ @Physics β‘
π23β€13π₯7
ββSmart glasses use acoustic touch technology to help blind people βseeβ using sound.
β Source : Click here
βββββββββββ
β’ @Physics β‘
β Source : Click here
βββββββββββ
β’ @Physics β‘
π25β€9π₯7π€©1
ββHandheld device uses eye-safe retinal spectroscopy to diagnose traumatic brain injury.
β Source : Click here
βββββββββββ
β’ @Physics β‘
β Source : Click here
βββββββββββ
β’ @Physics β‘
β€13π8π₯4π1
ββCharge qubits have several potential advantages over spin qubits (speed, ease of fabrication) but also a major disadvantage (coherence times of just ~100ns). Now researchers at Argonne National Laboratory are starting to change that.
β Source : Click here
βββββββββββ
β’ @Physics β‘
β Source : Click here
βββββββββββ
β’ @Physics β‘
β€9π₯8π4
ββAdiabatic Process Law
In thermodynamics, an adiabatic process (Greek: adiΓ‘batos, "impassable") is a type of thermodynamic process that occurs without transferring heat or mass between the thermodynamic system and its environment. Unlike an isothermal process, an adiabatic process transfers energy to the surroundings only as work. As a key concept in thermodynamics, the adiabatic process supports the theory that explains the first law of thermodynamics.
Some chemical and physical processes occur too rapidly for energy to enter or leave the system as heat, allowing a convenient "adiabatic approximation". For example, the adiabatic flame temperature uses this approximation to calculate the upper limit of flame temperature by assuming combustion loses no heat to its surroundings.
βββββββββββ
β’ @Physics β‘
In thermodynamics, an adiabatic process (Greek: adiΓ‘batos, "impassable") is a type of thermodynamic process that occurs without transferring heat or mass between the thermodynamic system and its environment. Unlike an isothermal process, an adiabatic process transfers energy to the surroundings only as work. As a key concept in thermodynamics, the adiabatic process supports the theory that explains the first law of thermodynamics.
Some chemical and physical processes occur too rapidly for energy to enter or leave the system as heat, allowing a convenient "adiabatic approximation". For example, the adiabatic flame temperature uses this approximation to calculate the upper limit of flame temperature by assuming combustion loses no heat to its surroundings.
βββββββββββ
β’ @Physics β‘
π₯16β€11π9π±2π€©1
ββCharles's Law
Charles's law (also known as the law of volumes) is an experimental gas law that describes how gases tend to expand when heated. A modern statement of Charles's law is:
When the pressure on a sample of a dry gas is held constant, the Kelvin temperature and the volume will be in direct proportion.
This law describes how a gas expands as the temperature increases; conversely, a decrease in temperature will lead to a decrease in volume.
The law was named after scientist Jacques Charles, who formulated the original law in his unpublished work from the 1780s.
βββββββββββ
β’ @Physics β‘
Charles's law (also known as the law of volumes) is an experimental gas law that describes how gases tend to expand when heated. A modern statement of Charles's law is:
When the pressure on a sample of a dry gas is held constant, the Kelvin temperature and the volume will be in direct proportion.
This law describes how a gas expands as the temperature increases; conversely, a decrease in temperature will lead to a decrease in volume.
The law was named after scientist Jacques Charles, who formulated the original law in his unpublished work from the 1780s.
βββββββββββ
β’ @Physics β‘
β€19π13π₯5
ββNanoparticles give laser wakefield accelerator a boost to 10 GeV
β Source: Click here
βββββββββββ
β’ @Physics β‘
β Source: Click here
βββββββββββ
β’ @Physics β‘
β€12π₯7π3