Type to see ranked matches. Use the up and down arrow keys to choose a result, then press Enter to open it.
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Keyboard graph navigation: press N for concepts or E for relations; use arrow keys, Home, and End to move; Enter selects; Shift plus Enter selects and centers; plus and minus zoom; zero fits; Escape clears the selection. Use the visible viewport buttons as alternatives to dragging, wheel, and pinch gestures.
Select a concept
Select any concept, construction junction, or annotated relation by pointer, touch, search, or keyboard.
Construction junctions are diamonds. They show where multiple structures must coexist on the same carrier and satisfy compatibility conditions.
Move selected concept
Single-pointer and keyboard alternatives to dragging. Each activation moves the selected concept one step.
Jean Perrin’s quantitative studies of Brownian particles tested Einstein’s statistical theory, estimated Avogadro’s number by several methods, and supplied strong evidence for molecular and atomic reality.
Agreement among Brownian-motion measurements of molecular scales and Avogadro’s number provided strong evidence that atoms and molecules are physical constituents rather than merely calculational devices.
How to interpret this relation type
The source theory, law, entity, prediction, or structural claim is directly tested, supported, constrained, or established by the target experiment or observation. Experimental support is not final logical proof; the edge detail states exactly what was measured.