0 th law of Thermodynamics Heat and temperature change Heat transfer Lecture 28: Heat energy and transport.

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Presentation transcript:

0 th law of Thermodynamics Heat and temperature change Heat transfer Lecture 28: Heat energy and transport

Zero-th Law of Thermodynamics Two objects in thermal contact, no interaction with the environment → will reach the same temperature after sufficient time. = Thermal equilibrium. Basis for any temperature measurement If two objects are in thermal equilibrium with a third object, they are in thermal equilibrium with each other.

Energy transfer If two objects are in contact: Energy transfer. Heat energy transferred because of difference in temperature. Heat is always flowing from hot object to cold object If heat is put into an object, its temperature rises.

Heat

Heat in phase changes liquidgas

Example g of tea at 70º C are poured into a 120g cup made of aluminum that is at a temperature of 20º C. What is the final temperature?

Example 2 You have 0.25 kg of water at 25 ºC and are adding ice to it that has a temperature of – 20ºC. How much ice is needed to that the final temperature of the mixture is 0ºC and all ice is melted? Neglect the container.

Three mechanisms of heat transfer Conduction Convection Radiation

Heat conduction

Material boundaries

Example A rod of uniform cross section has its left end placed in water of a temperature 10ºC and its right end at 40ºC. The left half of the rod consists of material A with a thermal conductivity of 400 W/mºC, the right half of material B with thermal conductivity of 200 W/mºC. The temperature in the middle of the rod is: A) 20ºCB) 25º CC) 30.5º CD) 18ºC

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