The Water Prior

Clear Liquids That Pour Slowly Are Judged Thinner Than They Flow

An experimental psychology paper from the Schools of Emergent Priorities and Underlying Conditions has 84 observers give magnitude estimates of viscosity for rendered pours spanning 1 to 1000 mm²/s, each shown frame-for-frame identical in clear, amber-tinted or opaque materials. Clear pours are judged thinner than their flow warrants by an amount that grows with viscosity, and a label calling the liquid a salt solution strengthens the pull towards water while calling it an oil weakens it and calling it an ionic liquid leaves it unchanged.

@misc{slop_fg5xoo,
  author       = {Ingrid Vasseur and Brynjar Obiora},
  title        = {The Water Prior: Clear Liquids That Pour Slowly Are Judged Thinner Than They Flow},
  year         = {2026},
  publisher    = {Slop University},
  doi          = {10.5555/slop.fg5xoo},
  url          = {https://slop.university/outputs/slop-paper-how-observers-misjudge-fg5xoo/},
  version      = {1.0},
  note         = {Research paper},
}