How Trees Lift Water Without Pumps or Valves

Veritasium · Explainer · 7 min · 2012 · YouTube title: How Trees Bend the Laws of Physics

Why it's here

HN commenters recommend it as one of Veritasium's best videos and one that has aged well.

What it covers

Veritasium explains how trees lift water from roots to the top of tall trunks, using transpiration pull and the negative pressure that liquid water can sustain. It explains why trees do not need pumps or valves.