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Bitumen can flow, but very, very slowly. To prove this, Parnell heated some bitumen and poured it into a glass funnel. He then allowed it to settle for several years. In 1930, the stem of the funnel was cut off and the bitumen was allowed to begin its slow journey downward.
The interesting story of the world’s slowest experiment that lasted a century
Bitumen can flow, but very, very slowly. To prove this, Parnell heated some bitumen and poured it into a glass funnel. He then allowed it to settle for several years. In 1930, the stem of the funnel was cut off and the bitumen was allowed to begin its slow journey downward.