Letter | Published:

Emissivity of Small Particles in Flames

Nature volume 162, page 259 (14 August 1948) | Download Citation



IT is a striking fact that solid (or massive) carbon behaves as a black body, whereas small carbon particles which are responsible for the luminosity of hydrocarbon flames have an absorption coefficient which is strongly dependent on wave-length. This difference is important in the measurement of the colour temperature of luminous flames. It has been shown theoretically by Mie1 that the, absorption coefficient is strongly dependent on wave-length when particles are smaller than a wave-length, an effect which is analogous though not identical with the dependency of scattered light on wave-length.

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  1. 1.

    , Ann. d. Phys., 25, 377 (1908).

  2. 2.

    , and , Acta Physicochim. U.R.S.S., 21, 3, 463 (1946).

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  1. Chemistry Department, Royal Aircraft Establishment, South Farnborough, Hants. April 12.

    • H. G. WOLFHARD
    •  & W. G. PARKER


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