# Flux & Physics: Explaining the Constancy of Flux

• harsh22902
In summary, flux is a physical quantity that measures the flow of a certain property through a surface and is an important concept in physics. In certain situations, the flux remains constant due to the conservation of flux, which can be explained by the laws of conservation of energy and mass. Real-life examples of flux and its constancy include the flow of water in a river and electricity in a circuit. The constancy of flux is utilized in various practical applications, such as engineering and environmental science, to predict and control the behavior of systems.
harsh22902
This is an excerpt from a high school physics textbook. I don't understand the possible reason behind this statement. If we change something in the circuit say for example add a resistor , the current and hence the flux should change. Then why/how is this statement true?

Correct, but not instantaneously: it takes time. https://www.electronics-tutorials.ws/inductor/lr-circuits.html is ##L/R##

davenn, vanhees71 and harsh22902

## 1. What is flux and how is it related to physics?

Flux is a measure of the flow of a physical quantity through a given surface. In physics, it is often used to describe the flow of energy, force, or particles through a surface. Flux is an important concept in many areas of physics, including electromagnetism, fluid dynamics, and thermodynamics.

## 2. Why is flux considered to be constant?

In many physical systems, flux is considered to be constant because the amount of the physical quantity flowing through a given surface remains the same over time. This can be due to the conservation of energy or mass, or because the system is in a steady state where the flow is balanced. In some cases, flux may vary, but it is often assumed to be constant for simplicity in calculations.

## 3. How is flux calculated and measured?

Flux is calculated by taking the dot product of the flow vector and the surface normal vector. In other words, it is the amount of the physical quantity passing through a unit area of the surface per unit time. Flux can be measured using various instruments such as flow meters, spectrometers, and calorimeters, depending on the type of flux being measured.

## 4. What factors can affect the constancy of flux?

Flux can be affected by a variety of factors, including changes in the physical properties of the system, such as temperature or pressure, or changes in the geometry of the surface through which the flux is passing. Additionally, external forces, such as gravity or electromagnetic fields, can also impact the constancy of flux.

## 5. How does understanding flux help us in understanding the behavior of physical systems?

Understanding flux is crucial in many areas of physics as it allows us to quantify and analyze the flow of physical quantities through various systems. By understanding how flux behaves and how it is affected by different factors, we can better predict and explain the behavior of physical systems, leading to advancements in various fields such as engineering, medicine, and environmental science.

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