When water boils in a pot with a loose lid, the increased pressure forces the lid upward, releasing steam and reducing the pres- sure in the pot so that the lid drops back down. If the water continues to boil, the lid can rattle upward and downward. Consider a 1 L pot half filled with boiling water. In this case there is half a liter, or 1 mol, of air and steam above the water. (a) Estimate the mass of the lid. (b) When the water is rapidly boiling, estimate the height to which the lid jumps during a steam-release event. (c) By multiplying the weight of the lid by the height of the jump, estimate the work done by the steam as the lid moves upward. (d) Treat the process as adiabatic and use the first law of thermodynamics to estimate the drop in the temperature of the steam as it pushes the lid upward

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
8th Edition
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Chapter9: Heat Transfer With Phase Change
Section: Chapter Questions
Problem 9.28P
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When water boils in a pot with a loose lid, the increased

pressure forces the lid upward, releasing steam and reducing the pres-

sure in the pot so that the lid drops back down. If the water continues to

boil, the lid can rattle upward and downward. Consider a 1 L pot half

filled with boiling water. In this case there is half a liter, or 1 mol, of

air and steam above the water. (a) Estimate the mass of the lid. (b) When the water is rapidly boiling, estimate the height to which the lid jumps during a steam-release event. (c) By multiplying the weight of the lid by the height of the jump, estimate the work done by the steam as the lid moves upward. (d) Treat the process as adiabatic and use the first law of thermodynamics to estimate the drop in the temperature of the steam as it pushes the lid upward.

19.36 •• When water boils in a pot with a loose lid, the increased
pressure forces the lid upward, releasing steam and reducing the pres-
sure in the pot so that the lid drops back down. If the water continues to
boil, the lid can rattle upward and downward. Consider a 1 L pot half
filled with boiling water. In this case there is half a liter, or , mol, of
air and steam above the water. (a) Estimate the mass of the lid. (b) When
1
11.2
the water is rapidly boiling, estimate the height to which the lid jumps
during a steam-release event. (c) By multiplying the weight of the lid by
the height of the jump, estimate the work done by the steam as the lid
moves upward. (d) Treat the process as adiabatic and use the first law of
thermodynamics to estimate the drop in the temperature of the steam as
it pushes the lid upward.
Transcribed Image Text:19.36 •• When water boils in a pot with a loose lid, the increased pressure forces the lid upward, releasing steam and reducing the pres- sure in the pot so that the lid drops back down. If the water continues to boil, the lid can rattle upward and downward. Consider a 1 L pot half filled with boiling water. In this case there is half a liter, or , mol, of air and steam above the water. (a) Estimate the mass of the lid. (b) When 1 11.2 the water is rapidly boiling, estimate the height to which the lid jumps during a steam-release event. (c) By multiplying the weight of the lid by the height of the jump, estimate the work done by the steam as the lid moves upward. (d) Treat the process as adiabatic and use the first law of thermodynamics to estimate the drop in the temperature of the steam as it pushes the lid upward.
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