The main parameter while calculating heat transfer is heat flux. In mathematics and physics flux is used as the basic and global word. Heat flux is the rate of thermal energy flow per unit surface area of the heat transfer surface, e.g, in a heat exchanger. To define flux, first there must be a quantity q which can flow or move, such as mass, energy, electric charge, momentum, number of molecules, etc.Let ρ be the volume density of this quantity, that is, the amount of q per unit volume.. In physics, there are a large number of physical quantities we include while performing calculations. In metallurgy, a flux (derived from Latin fluxus meaning "flow") is a chemical cleaning agent, flowing agent, or purifying agent. The word “Flux” is originated from the Latin Word ‘Fluxus’ that means flow. A flux is the value of the surface integral of any vector field. They are used in both extractive metallurgy and metal joining. Flux is the presence of a force field in a specified physical medium, or the flow of energy through a surface. Rosin used as flux for soldering. Heat Flux Density – Thermal Flux. Flux is a common phenomenon throughout the natural world and has become a ubiquitous concept throughout physics and mathematics, and hence technology. Trying to understand flux by looking at a mess of integrals is not the way to go. Flux is relatively simple to understand, and is really helpful in vector calculus and physics. List of common physics notations 1 List of common physics notations Latin characters Symbol Meaning SI Unit of Measure area magnetic vector potential Amplitude acceleration meter per second squared (m/s²) or (ms−2) magnetic flux density also called the magnetic field density or magnetic induction tesla (T), or equivalently, Note that bold text indicates that the quantity is a vector The way that this quantity q is flowing is described by its flux. Conversely, the magnitude of the field is given by the flux per unit area. Help with GCSE Physics, AQA syllabus A AS Level and A2 Level physics. This is a list of common physical constants and variables, and their notations. First get an intuitive understanding, and the details will make more sense. The rate of heat transfer per unit area normal to the direction of heat transfer is called heat flux.Sometimes it is also referred to as heat flux density.In SI its units are watts per square metre (W.m −2).It has both a direction and a magnitude, and so it is a vector quantity. There are 3 types of generalized classification is there that helps to distinguish between heat fluxes by convection, heat conduction, and radiation. Insights. Isaac Newton first used this term as fluxion into differential calculus. Flux means an imaginary lines through which a physical quantity can travel. Fluxes may have more than one function at a time. Physics revision site - recommended to teachers as a resource by AQA, OCR and Edexcel examination boards - also recommended by BBC Bytesize - winner of the IOP Web Awards - 2010 - Cyberphysics - a physics revision aide for students at KS3 (SATs), KS4 (GCSE) and KS5 (A and AS level). Flux describes the flow of a physical property through space and is often coupled with a time variation. A continuity equation is useful when a flux can be defined. In electronics, the term applies to any electrostatic field and any magnetic field . To make it more convenient for users and easier to use and remember, we often use notations/symbols to represent these physical quantities. Flux is depicted as "lines" in a plane that contains or intersects electric charge poles or magnetic poles. If the field is constant over the area of interest, the flux is simply the product of the field and the area. In electronics, the term applies to any electrostatic field and any magnetic field . 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