What Every Fire Fighter Should Know

Issue 25 and Volume 68.

What Every Fire Fighter Should Know (Continued from page 1210) Relation of Heat and Work If a bearing in a motor, for instance, is permitted to remain without oil, it will heat to an excessive temperature after the motor has run for a few minutes. Were the power consumed by the motor under such conditions calculated, and then again when the bearing has been properly lubricated and the motor is operating normally, it would be found that the power required in the first case was much greater than in the second. The difference in power in the two instances is dissipated in the form of heat, which is absorbed in the bearings. In other words, a large percentage of the mechanical work done by the machine is converted directly into heat. There is a definite relation between heat and work. Work can be changed into heat; heat can be changed…

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