By Ya. A. Smorodinsky
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Additional resources for Temperature (Science for Everyone)
Example text
A pendulum may swing in different planes, or a wheel can be rotated in any direction. The situation is quite different in the case of heat for a hot kettle in a room cools down "of itself", but cannot warm up "of itself"; in order to freeze the contents of a refrigerator, work has to be done. A room can be heated by an electric radiator, but the radiator cannot be heated up at the expense of cooling the room. Heat invariably flows so that temperatures level off and a system reaches a thermal equilibrium.
Heat invariably flows so that temperatures level off and a system reaches a thermal equilibrium. The transition to thermal equilibrium may be a complicated and rather protracted process. We say that a container is thermally insulated if the heat flow is ininimized——that is the principle of thermos flasks. More complicated situations are possible. In a hot plasma the tempera- Heat and Cold 35 ture of the electrons may differ from that of the ions (as if we had a mixture of gases at unequal temperatures) and the two temperatures level off rather slowly.
Hence, this ether was thought to be the carrier of thermal energy and, as a result, the carrier of temperature as well. The progress of science is an extremely interesting and complicated process. The charm of the chosen path can be admired only when the destination is reached; at the start science looks like a maze in which all passages end in cul—de8808. Unfortunately, lessons drawn from the history of science often do not bear fruit: new researchers start along wrong paths just as sure of themselves and the ones who succeed in linding a true approach are only those who overcome the conservatism of traditional thinking.