User Account

All Pages

Define Thermal equilibrium, Other Engineering

Assignment Help:
Thermal equilibrium
The definition and measurement of temperature must be logically preceded by the concept of thermal equilibrium and the Zeroth law. To determine operationally whether two systems are in thermal equilibrium, they are placed together in contact and isolated from the surroundings. If one of them is hot and the other cold then, after a certain period of time, the former feels less hot and the latter feels less cold. Simultaneously, changes in their physical properties, such as length, electrical resistance, etc. occur. After a sufficiently long time (equivalent to the relaxation time) no further changes take place. The two systems are then said to be in thermal equilibrium; they are said to have the same temperature.
Definition
Two systems are equal in temperature if no change in any physical property occurs when they are brought into communication. This definition must not be reversed. It does not imply that “when two systems are equal in temperature, no changes result from their communication”. For instance, if an electric lamp and a battery are connected by means of an electrical conductor, then the lamp will light up; this is, of course, a work interaction. Temperature is at the heart of the difference between work and heat; hence, the necessity to employ rigour in defining concepts relating to temperature. Two points are of significance with reference to the discussion on thermal equilibrium and equality of temperature:
• If the definition of temperature equality has to be given in such a manner as to apply equally well when it is reversed, the following condition should be added : “in the absence of any work interactions”.
• The process of “communication” indicated in the definition is in fact “thermal” communication (excluding any “work interactions”). But this usage leads to circularity and hence is not employed until after temperature equality is defined.

Related Discussions:- Define Thermal equilibrium

Differentiator, Differentiator: With negative feedback applied through ...

Differentiator: With negative feedback applied through a resistor and the input signal through a capacitor, the circuit will perform the mathematical operation of differentiati

NIRAN, Why spiral model is called meta model?

Why spiral model is called meta model?

Re-heat ignition system in aircraft engine, Re-heat Ignition The atomis...

Re-heat Ignition The atomised fuel spray is fed into the re-heat jet pipe and ignited by one of three methods:- • Spark Ignition • Hot Streak Ignition • Catalytic Ignition a

Oil filter debris analysis, Oil Filter Debris Analysis Oil filters serv...

Oil Filter Debris Analysis Oil filters serve an important function within the lubrication system of a gas turbine engine in that they remove foreign particles that collect in t

Slip and slip plane, Q. What is slip? What is slip plane? What are principa...

Q. What is slip? What is slip plane? What are principal if slip planes and slip direction for BCC, FCC and HCP crystal? Ans. X-ray diffraction studies show that the crystalli

Small business management, how to calculate the ratio and break-even point ...

how to calculate the ratio and break-even point in one report

Combustion process, Combustion process: Air from the engine compressor ...

Combustion process: Air from the engine compressor enters the combustion chamber at a velocity up to 500 feet per second, but because at this velocity the air speed is far too

Aeroengine - degree of reaction, Degree of reaction measures the way compre...

Degree of reaction measures the way compression or expansion (for turbines) is shared between rotor and stator shared between rotor and stator of a stage (stage ≡ rotor + stator)

Pn junction diode, what is the effect of temperature on pn junction diode o...

what is the effect of temperature on pn junction diode of component

#digital electronics, #Design 2:1 MUX with strobe input using NAND gates

#Design 2:1 MUX with strobe input using NAND gates

Write Your Message!

Captcha
Order Assignment

Featured Services

Order Now

Popular Subjects

Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

Submit Assignment

Academics

Major Subjects

Majors

Get In Touch

whatsapp: +91-977-207-8620

Phone: +91-977-207-8620

Email: [email protected]

TERMS & POLICIES

HELP & SUPPORT

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd