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Florin Périer performs the Puy-de-Dôme mercury experiment on Pascal’s instructions

On 19 September 1648 Florin Périer, at Pascal’s request, carried mercury tubes up the Puy-de-Dôme and recorded a falling column, public evidence against a plenist horror of vacuum. In the causal graph this event strengthens Digital Learning Access, a driver that weakens Learning Poverty Rate (low- and middle-income countries) — an improving welfare path.

Sources: [1][2]

Read the full account

On 19 September 1648 Florin Périer, at Pascal’s request, carried mercury tubes up the Puy-de-Dôme and recorded a falling column, public evidence against a plenist horror of vacuum. Pascal designed the test; he was not necessarily on the summit.

Context

Shared labour with Périer and local witnesses is stated. The result fed print controversy with Père Noël and others. Vacuum physics is not a clinic.

Blaise Pascal is not the sole author of every later object, law, or museum label that uses the name. Shared work with courts, excavators, printers, spouses, officials, and later states does not erase a documented role, and it does not make an ancient person the signer of a twentieth-century statute.

Why it matters

A dated public experiment is a knowledge path. High confidence on 19 September 1648 as received.

Who was responsible

Contribution type and responsibility level for each recorded actor — not sole-author shorthand.

  • Blaise Pascal

    Person

    Direct responsibility

    responsibility level 0.32 · verified

    Mathematician, Jansenist controversialist, and inventor as documented. Printers, Port-Royal, and later metrologists reuse the name.

What changed

Fact → Driver → Indicator. Relationship strength orders the paths; it is not the observed indicator movement.

Evidence

The sources behind this fact and its verification state.

Verified2 sources on file
  1. 1.Britannica — vacuum (physics)Encyclopaedia Britannica · High credibility · verified
  2. 2.Ville de Clermont-FerrandVille de Clermont-Ferrand · High credibility · verified
What the sources establish

Later competitions, monuments, translations, UNESCO listings, and museums are not converted into extra lifetime acts. That reading is an impact-path choice, not a property stored on the Fact itself. Confidence is stated on the impact path. A later English edition is not a recovered autograph. If a number is not in the two records named above, it is not supplied here. Confidence is stated on the impact path.

Causal path

How this event connects to drivers and indicators in the graph.

  1. ActorBlaise Pascal
  2. contributed toFactFlorin Périer performs the Puy-de-Dôme mercury experiment on Pascal’s instructions
  3. strengthensDriverDigital Learning Access
  4. weakensIndicatorLearning Poverty Rate (low- and middle-income countries)

Cite this page

Factrail. (2026). Florin Périer performs the Puy-de-Dôme mercury experiment on Pascal’s instructions. Factrail. https://factrail.ai/facts/pa-puy-de-dome-1648

https://factrail.ai/facts/pa-puy-de-dome-1648

Accessed 16 October 2026.

By the Factrail desk · Method: how we source and score · Last reviewed

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