arXiv preprint shows household oil viscosity drops measurably between 20 °C and 60 °C using timed funnel flow

The authors used only a digital thermometer, a plastic funnel, a stopwatch app, and 500 mL samples of canola, olive, and soybean oil. They recorded efflux times at 5 °C increments while stirring gently to maintain uniform temperature, then converted times to relative viscosity via Poiseuille’s relation calibrated against water. Repeatability across three oils and two funnel diameters yielded coefficients of variation below 6 %.

Viscosity-temperature curves matched published laboratory data within 8 %, confirming that the dominant effect is the exponential weakening of van der Waals forces between triglyceride chains rather than any chemical change. The kitchen method therefore reproduces the same Arrhenius dependence seen in rheometers, but at zero equipment cost.

Food-science literature has long noted that batter adhesion and frying oil uptake vary with temperature, yet quantitative classroom links remain rare; this demonstration closes that gap without invoking specialized apparatus. It also highlights why cold oil appears “thicker” when coating pans and why pre-heating reduces splatter.

Next steps include crowdsourced replication via a simple web form to test oil age and type effects, with data release planned for 2025.