ial in question. This is especially true inthe case of sighting upon molten metals which, when issuing fromthe furnace, generally present a clear surface, comparatively freefrom oxide. A slight film of oxide, in general, greatly increasesthe emissivity of the substance, and the pyrometer then reads… … 600 700 800 Observed temperature °C 900 1000 1100 1200 1300 FlG. 32.—True temperatures vs. temperatures observed with radiation pyrometer sighted upon materials in the open small in the case of solid iron or nickel at high temperatures inair, since the surface upon exposure to air almost…
Thermometry, pyrometry and calorimetry · Heat flow, thermal and thermodynamic processes
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