Today's slate is unusually thin — most candidates are Shorts, exam-paper walkthroughs, or hashtag-spammed clips of industrial footage. This one stands out because it's an actual physical lab experiment built to teach a specific principle, and the creator is brand new (a single subscriber) which is exactly the kind of channel worth surfacing.

Torricelli's Law states that the efflux velocity of fluid from an orifice equals √(2gh) — the same speed an object would reach falling freely from the fluid's surface height. It falls out of Bernoulli's equation once you assume the tank's free surface moves negligibly compared to the jet. The "Torricelli Fountain" variant is a clever demonstration: water exiting a sealed bottle drives a fountain whose height directly visualizes the predicted velocity.

What makes a homebuilt version of this experiment worth watching is the gap between the clean textbook derivation and real behavior. Viscous losses, vena contracta at the orifice, and air-pressure effects in a partially sealed container all conspire to make the measured jet height fall short of the ideal. A good lab video lets you see those discrepancies and reason about which assumption broke down — far more instructive than a derivation on a whiteboard.

Caveat: with one subscriber and no preview footage, production quality is unknown — but the premise is solidly educational.