Click a bottle to sound it. Drag up or down on a bottle to pour. Keys 1–8 play, B and S switch between blowing and striking.

Tuner

The same bottle, both ways

This is the whole claim in one picture. The blue curve is the bottle blown; the orange curve is the same bottle struck. Pouring water in moves them in opposite directions, so “filling a bottle lowers its note” is false for one and true for the other.

Also show the air column above the water, which is the explanation people usually give for the struck bottle and which predicts the wrong sign

Water levels

Setup

Bottle Scale Root note Bottles Air temperature (°C) In-tune tolerance (cents) Struck mode shape Neck end correction Treat the rim as flanged (flush in a rigid plane) rather than a bare pipe end

Where every number comes from

What the simulations found

None of these numbers is typed into the page. They are produced by tools-harness.js and tools-study.js and written into js/findings.js by a generator, and the page harness re-checks each one against the file it came from.

Bottle Organ