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#temperature equilibrium

3 public questions tagged with this topic.

Ideal Gas Laws and Thermal Properties

What determines the final temperature when two objects of different temperatures are mixed in a calorimeter?

The final temperature is determined by the principle of conservation of energy, where heat lost by the hotter object equals heat gained by the colder one, reaching thermal equilibrium. As per NCERT, applying relevant law/formula with correct units and sign convention leads to Conservation of heat energy. This satisfies dimensional consistency and physical conditions given, so option D is scientifically correct.

Ref: NCERT Class 11 Physics, Chapter 11: Thermal Properties – Calorimetry.

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Latent Heat and Phase Transitions

A 0.3kg lead block at 350∘C is placed in 0.6kg water at 25∘C. Find the final temperature. (Specific heat of lead = 127.7

0.3×127.7×(350−T) = 0.6×4186×(T−25). 13408.5−38.31T = 2511.6T−62790. 13408.5+62790 = 2511.6T+38.31T. 76198.5 = 2549.91T⇒T≈29.89∘C≈29.9∘C. As per NCERT, applying relevant law/formula with correct units and sign convention leads to 29.9°C. This satisfies dimensional consistency and physical conditions given, so option B is scientifically correct.

Ref: NCERT Class 11 Physics, Chapter 11: Thermal Properties – Calorimetry.

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Thermodynamics

Which law of thermodynamics defines temperature equilibrium?

Zeroth law is the scientifically accurate answer to this question. Within the study of Thermodynamics, this concept is well-established through extensive research and is documented in standard scientific literature. The specific properties, mechanisms, or characteristics of Zeroth law directly address what is being asked. Among the other options, First law, Second law, and Third law do not correctly answer this question because they either refer to different concepts, describe properties of other molecules or processes, or represent common misconceptions about this topic.

Ref: Lehninger Principles of Biochemistry, Nelson & Cox, 8th Ed., Ch. 1

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