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METROLOGIE TEPLOTY

P9. 2. Ji

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METROLOGIE TEPLOTY

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    1. P9 1 METROLOGIE TEPLOTY

    2. P9 2 Ji dvno si lid vimli zvltnho stavu ltek, kter nazvali studen nebo tepl. Galileo Galilei sestrojil prvn detektor teploty, zaloen na roztanosti plynu. Podobne na roztanosti kapalin byly zaloeny teplomery, kter daly nzvy i teplomernm stupnicm: Celsiova, Fahrenheitova a Raumurova.

    3. P9 3 Co je to teplota ? Teplota je mrou kinetick energie pohybujcch se molekul (nebo cstic). Definice jednotky teploty: Jednotka termodynamick teploty kelvin, znacka K, je definovna pomoc trojnho bodu vody: Trojn bod vody m termodynamickou teplotu 273,16 K.

    4. P9 4 Trojn bod ltek Trojn bod je urcit teplota a tlak, pri kterch koexistuj tri skupensk fze, tuh (s), kapaln (l) a plynn (g). Podle Gibbsova pravidla fz nem trojn bod dn stupen volnosti:

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