Today in Fluid Dynamics: “Can a Toilet Promote Virus Transmission?”

Pressure from the pandemic is bringing an urgent flow of partial information about the safety-or-danger of everyday activities. That flow brings us this new study: “Can a Toilet Promote Virus Transmission? From a Fluid Dynamics Perspective Featured,” Yun-yun Li, Ji-Xiang Wang, and Xi Chen, Physics of Fluids, vol. 32, 2020, 065107. The authors, at Southeast […]

The naturally agglomerated state

Some particle analyzers do not include a free fall model, a non-inclusion that can be frustrating for individuals of a certain temperament when they wish to  analyze samples in their naturally agglomerated state. Investigator Pam Razin writes to inform us the the Cilas model #118o does not suffer from this deficiency. Its manufacturer explicitly states: […]

On the up and up: levitating particles & a frog, with sound & magnets

Two visual demonstrations of levitation, each using known physics properties: 1. Using sound waves to levitate particles [REFERENCE: “Three-dimensional Mid-air Acoustic Manipulation by Ultrasonic Phased Arrays,” Yoichi Ochiai, Takayuki Hoshi, Jun Rekimoto, (2013) arXiv:1312.4006.. Thanks to @BetsytheDevine for bringing this to our attention.]: 2. The Ig Nobel Prize-winning levitation of a frog, using magnets [REFERENCE: “Of […]