alleryStart learning →When are two objects in contact said to be in thermal equilibrium?
AWhen they are at the same pressure
BWhen they are at the same temperature
CWhen they have equal masses
DWhen they have equal volumes
Answer & Solution
Correct answer: B. When they are at the same temperature
1. When two objects in contact reach the same temperature, no more net heat transfer occurs between them.
2. This condition, where temperatures are equal and stable, is called thermal equilibrium.
3. Pressure, mass, and volume are separate physical quantities and are not what defines thermal equilibrium.
4. So equal temperature is correct.
_Source: OpenStax Physics (CC BY 4.0), Ch 12 "Thermodynamics", section 12.1 Zeroth Law of Thermodynamics: Thermal Equilibrium_
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