Question

(i) ऊष्मागतिकी का शून्य नियम क्या है?
(ii) उदासीनीकरण ऊष्मा को परिभाषित कीजिये। udahran
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Answer 1

(i) ऊष्मागतिकी के शून्य नियम के अनुसार जब कोई दो निकाय, एक तीसरे निकाय के साथ अलग-अलग ऊष्मीय सन्तुलन में हैं, तो वे एक-दूसरे के साथ भी ऊष्मीय सन्तुलन में होंगे।

(ii) प्रबल अम्ल एवं प्रबल क्षार से प्राप्त लवण जल में पूर्ण आयनित होते हैं, अतः इनके उदासीनीकरण प्रक्रिया में केवल एक ही क्रिया होती है। H+ व OH- आयनों के संयोग से अनआयनित जल का बनना अतः प्रत्येक प्रबल अम्ल व प्रबल क्षार के उदासीनीकरण ऊष्मा का मान समान रहता है जो – 13.7 Kcal या- 57.32 kJ होती है।

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Answer 2

Answer:

‌The zeroth law of thermodynamics states that if two thermodynamic systems are each in thermal equilibrium with a third system, then they are in thermal equilibrium with each other.[1] Accordingly, thermal equilibrium between systems is a transitive relation.

Two systems are said to be in the relation of thermal equilibrium if they are linked by a wall permeable only to heat and they do not change over time.[2] As a convenience of language, systems are sometimes also said to be in a relation of thermal equilibrium if they are not linked so as to be able to transfer heat to each other, but would still not do so (even) if they were connected by a wall permeable only to heat.

The physical meaning is expressed by Maxwell in the statement: "All heat is of the same kind".[3] Another statement of the law is "All diathermal walls are equivalent".[4](pp 24, 144)

The law is important for the mathematical formulation of thermodynamics, which depends on the assertion that the relation of thermal equilibrium is an equivalence relation, The condition justifies the use of practical thermometers