Mystery Orange: Peel On vs Off
Whole orange floats while peeled one sinks.
Teaching & key ideas
What you do: Float whole orange, then peeled orange.
What students see: Whole orange floats while peeled one sinks.
Why it works: Air pockets in the peel lower average density.
Question to ask: Did removing something make it heavier or denser?
Lesson flow
Predict → demonstrate → observe → briefly explain → ask: Did removing something make it heavier or denser?