Physics - Heat & Thermo Question with Solution | TestHub
PhysicsHeat & ThermoThermal ExpansionMedium2 minQB
PhysicsMediumstatement
Is boiling of a liquid is possible without supplying heat?
Evaluate the following statements.
Statement I: No; boiling is impossible unless a heater is attached.
Statement II: Yes; lowering the external pressure below the liquid vapour pressure can cause boiling, with energy drawn from the liquid itself.
Options:
Answer:
C
Solution:
Yes, by lowering the external pressure. A liquid boils when its saturated vapour pressure equals the external pressure. If the pressure over hot water is reduced below its vapour pressure (for example with a vacuum pump), it boils; the latent heat comes from the liquid itself, which cools until boiling stops. Statement I is false and Statement II true. Correct option: (C).
Subject:PhysicsTopic:Heat & ThermoSubtopic:Thermal Expansion
⏱ 2mℹ️ Source: QB
Doubts & Discussion
Loading discussions...
