Absorptivity, Reflectivity, and Transmissivity

A brief discussion on Absorptivity, Reflectivity, and Transmissivity of radiative heat transfer Everything around us constantly emits radiation (for heat transfer), and the emissivity represents the emission characteristics of those bodies. This means that every body, including our own, is constantly bombarded by radiation coming from all directions over a…

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Heat and Work [Fully Explained with Interrelationship]

Heat and Work Both heat and work refer to processes by which energy is transferred to or from a substance. What is Heat When energy is exchanged between thermodynamic systems by thermal interaction, the transfer of energy is called heat. The units of heat are therefore the units of energy,…

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Pure substance and two property rule

Let we first go through the definition of pure substance to understand its meaning. “A pure substance is defined as one that is homogeneous and invariable in chemical composition throughout its mass” To understand the definition let us first we understand the meaning of the word homogeneous. The word homogeneous…

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Quasi static process in thermodynamics

Quasi static process is a thermodynamic process which is generally used to determine actual path followed by the process while changing its state. To understand this topic in deep first we should understand the meaning of the word ‘Quasi’. Meaning of ‘Quasi’ is ‘almost’. So, the meaning of ‘Quasi static’…

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Availability and dead state of a thermodynamic system

When a system is not in equilibrium (or dead state in this case) with its surroundings there is an opportunity in convert this departure from equilibrium to some useful work. For example, if there is a difference between the temperature of system and surroundings then this temperature difference can be…

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