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Class18-1

# Class18-1 - Heat is 1 2 measured in the same units as...

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2/17/12 Oregon State University PH 202, Lecture 18 1 Heat is… 1. measured in the same units as temperature. 2. energy transferred between objects as a result of their temperature difference. 3. what an object has because it has a temperature. 4. the total energy contained in an object. 5. none of the above.

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2/17/12 Oregon State University PH 202, Lecture 18 2 Specific Heat Capacity If we have two bodies, at temperatures T 1 and T 2 (with, say, T 1 > T 2 ), we know that when we put them into thermal contact, heat will flow from the warmer body (#1) to the cooler body (#2). In fact, this is the qualitative meaning of temperature. Such an energy flow will continue until both bodies reach a common, intermediate temperature, T . They are then said to be in thermal equilibrium . At what intermediate temperature does this equilibrium occur? It depends—on a number of factors. First, we need to ask a more basic question: How much heat energy do we need to put into a given body in order to raise its temperature by a given amount? The answer is (again): “It depends.”
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