hemispherical temperature

hemispherical temperature
n, abbr. HT
in reference to the fusibility of coal and coke ash according to Test Method D1857, the temperature at which the cone has fused down to a hemispherical lump at which point the height is one half the width of the base. D1857

ASTM D121-09a Standard Terminology of Coal and Coke. 2014.

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