All thermos containers have a thin region of vacuum between the outer casing and the inner reservoir. It takes a long time for very hot or very cold liquids inside the thermos to reach room temperature because (A) vacuums have a low thermal conductivity (B) vacuums have a low heat capacity (C) radiation cannot travel across a vacuum (D) the second law of thermodynamics forbids rapid temperature changes
All thermos containers have a thin region of vacuum between the outer casing and the inner reservoir. It takes a long time for very hot or very cold liquids inside the thermos to reach room temperature because (A) vacuums have a low thermal conductivity (B) vacuums have a low heat capacity (C) radiation cannot travel across a vacuum (D) the second law of thermodynamics forbids rapid temperature changes
Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
8th Edition
ISBN:9781305387102
Author:Kreith, Frank; Manglik, Raj M.
Publisher:Kreith, Frank; Manglik, Raj M.
Chapter8: Natural Convection
Section: Chapter Questions
Problem 8.26P
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All thermos containers have a thin region of vacuum between the outer casing and the
inner reservoir. It takes a long time for very hot or very cold liquids inside the thermos to
reach room temperature because
(A) vacuums have a low thermal conductivity
(B) vacuums have a low heat capacity
(C) radiation cannot travel across a vacuum
(D) the second law of
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