A liquid partially fills a container. Explain why the temperature of the liquid decreases if the container is then partially evacuated. (Using this technique, it is possible to freeze water at temperatures above 0°C.)
Answer to relevant QuestionsA vessel containing a fixed volume of gas is cooled. Does the mean free path of the molecules increase, decrease, or remain constant in the cooling process? What about the collision frequency?Why does a diatomic gas have a greater energy content per mole than a monatomic gas at the same temperature?A heat engine performs 200 J of work in each cycle and has an efficiency of 30.0%. For each cycle, how much energy is: (a) Taken in and (b) Expelled by heat?A Carnot engine has a power output of 150 kW. The engine operates between two reservoirs at 20.0°C and 500°C. (a) How much energy does it take in per hour? (b) How much energy is lost per hour in its exhaust?Here is a clever idea. Suppose you build a two-engine device such that the exhaust energy output from one heat engine is the input energy for a second heat engine. We say that the two engines are running in series. Let e 1 ...
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