A copper sheet of thickness 2L = 2 mm has an initial temperature of T; 120°C. It is suddenly quenched in liquid water, resulting in boiling at its two surfaces. For boiling, Newton's law of cooling is expressed as q = h(T, – Tsat), Wwhere T, is the solid surface temperature and Tsat is the saturation temperature of the fluid (in this case Tsat = 100°C). The convection heat transfer coefficient may be expressed as h the sheet to reach a temperature of T = 102°C. = 1010W/m? · K*(T – Tsat)². Determine the time needed for The time needed for the sheet to reach a temperature of 102°C is i 0.189 S.

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Entropy

In physics, entropy means the amount of disorder or the degree of randomness associated with a thermodynamic system. The system is not self-organized when the entropy of the system is high. For instance, when a system is at an elevated temperature, its molecules are in random motion, vibrating and colliding with each other. During this scenario, the probability of finding a molecule at a particular place twice, is low. Under this circumstance, the system can be said to be in a high entropy.