from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Amount of energy.


From the need of the boiler of a steam locomotive to exceed a minimum amount of pressure (See head ("buildup of fluid pressure"), also pressure head.) before the locomotive could start moving. (Wiktionary)


  • The Migs were not too pleased when they found that by then we were really carrying a head of steam and that their aircraft could not compete with us down low.

    Thud Ridge


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