Poynting Effect, more than one meaning?

[beech]

A thermodynamics book defines Poynting effect--mist in equilibrium above a lake has lower temperature. Work is required to offset the surface tension of the droplets, hence the temperature drops slightly.
On the other hand, internet sources give the Poynting effect as a topic in radio waves.

 

[sokrates]

Poynting Vector is the product of the Electric Field and Magnetic field vector of an electromagnetic wave, which gives the electromagnetic power of the wave at the point it is calculated.

Poynting Effect is related to the analogy you gave. It is a thermodynamical concept.

But I never saw poynting "vector" being mentioned as an effect, so maybe these are not confused very frequently.

 

[oswaler]

The term "Poynting effect" does indeed have more than one meaning, depending on the context in which it is used. In thermodynamics, it refers to the decrease in temperature observed in a mist above a lake due to the work required to offset the surface tension of the droplets. This is a well-established phenomenon and is supported by scientific evidence.

However, in the context of radio waves, the Poynting effect refers to the flow of energy in an electromagnetic field. This concept was first introduced by John Henry Poynting in 1884 and is widely used in the study of electromagnetism. It describes the direction and magnitude of energy flow in a given electromagnetic field and is an important concept in understanding the behavior of radio waves.

While these two meanings of the Poynting effect may seem unrelated at first glance, they both deal with the transfer of energy in different forms. In thermodynamics, it is the transfer of energy due to surface tension, while in electromagnetism, it is the transfer of energy in the form of electromagnetic waves. Both are valid and scientifically supported concepts, and it is important to understand the context in which the term is being used in order to fully grasp its meaning.