Capillary Tubes Rise to Different Heights
Water rises higher in narrower tubes.
Teaching & key ideas
What you do: Place ends in same water reservoir.
What students see: Water rises higher in narrower tubes.
Why it works: Adhesion and surface tension pull water upward; tube radius changes balance with gravity.
Question to ask: Why does narrower sometimes mean higher?
Lesson flow
Predict → demonstrate → observe → briefly explain → ask: Why does narrower sometimes mean higher?