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Class14 - Temperature and Heat What are they What's the...

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2/8/12 Oregon State University PH 202, Lecture 14 1 Temperature and Heat What are they? What’s the difference? Heat is the transfer of energy from one object to another— specifically, the kinetic energy of the random motions of particles in the objects. Temperature is a measurement that compares the average kinetic energy per particle (atom or molecule) in any two objects. If one object has a higher average than the other, the hotter object can impart some of that energy to the other—via heat flow. Thus temperature tells us which way heat will flow between two objects that are in thermal contact.
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2/8/12 Oregon State University PH 202, Lecture 14 2 How do we quantify temperature? It’s an indicator of the average kinetic energy of the particles within any substance. But we can’t put a stopwatch on a molecule or atom to see how fast it’s bumping around (and besides, that speed varies). We need a temperature scale —a set of reference temperatures (using reliable natural phenomena) against which we measure all others. We choose convenient reference points and arbitrarily assign those temperature values: The boiling point of pure water at standard atmospheric pressure is assigned a temperature of 100°C (100 hundred degrees Celsius) or 212°F (212 degrees Fahrenheit).
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