A red-hot steel component is dropped into a vat of liquid coolant that is exactly at its boiling point. As the steel transfers extreme heat into the coolant, the fluid begins to boil vigorously. Assuming the vat is open to the atmosphere, what happens to the temperature of the remaining liquid coolant while this boiling phase change is actively occurring?
- It remains constant because the absorbed thermal energy is used entirely to change the liquid into a gas.Cevap
- BIt continues to rise steadily since extreme heat is being continuously transferred into the fluid.
- CIt decreases momentarily because the rapid bubbling action creates strong convective cooling currents.
- DIt increases at a significantly slower rate because the liquid expands, distributing the heat over a larger volume.
Cevap
It remains constant because the absorbed thermal energy is used entirely to change the liquid into a gas.
During a phase change like boiling or melting, the temperature of a substance remains completely flat (forms a plateau) even though heat is continually being added. The thermal energy from the red-hot steel is absorbed by the coolant as 'latent heat of vaporization'. This energy strictly breaks the physical bonds between the liquid molecules to turn them into a gas, so the average kinetic energy (which dictates temperature) of the remaining liquid stays exactly the same.
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Latent Heat and Phase Change Plateaus
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