ring-and-ball test

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ring-and-ball test [¦riŋ ən ¦bȯl ‚test]

(chemical engineering)

A test for determining the melting point of asphalt, waxes, and paraffins in which a small ring is fitted with a test sample upon which a small ball is then placed; the melting point is that temperature at which the sample softens sufficiently to allow the ball to fall through the ring. Also known as ball and ring method.

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