the.com/viscosity
the universe's way of telling fluids to slow down and think it over
means Viscosity is a fluid's internal resistance to flowing — how thick and sluggish it is, the reason honey crawls while water races.
from From Latin 'viscum,' meaning mistletoe — and the sticky birdlime made from its berries that fowlers smeared on branches to trap birds. Late Latin grew 'viscosus,' meaning 'sticky,' which English borrowed through the sciences as 'viscosity.' So buried in the word for how slowly molasses pours is the memory of a clingy white-berried plant and the glue squeezed from it.
- pitch drop
- Tar flows so slowly one drop falls per decade
- honey vs water
- Honey is roughly 2,000 times thicker than water
- shear thinning
- Ketchup gets runnier the harder you shake it
- glass myth
- Old window glass doesn't actually flow downward over centuries
- poise unit
- Named after physicist Poiseuille, who studied blood flow
for instance
motor oil sae 40 — approximately 100 pascal-seconds at operating temperature, measured by automotive viscosity standards