Tyndall effect: solution, suspension, colloidटिंडल प्रभाव: विलयन, निलंबन, कोलॉइड

NCERT Fig 5.3 · interactive diagram

Parts and their functions

• Laser beam (लेज़र किरण) — Viewed from the side. Never look straight into a laser.
• Solution (salt + water) (विलयन (नमक + जल)) — Particles < 1 nm — too small to scatter light, so the beam path is invisible. No Tyndall effect.
• Suspension (chalk + water) (निलंबन (चॉक + जल)) — Particles > 1000 nm scatter light (path visible), but they settle on standing and are removed by filtration.
• Colloid (milk + water) (कोलॉइड (दूध + जल)) — Particles 1–1000 nm: looks uniform, does not settle, passes through filter paper — but scatters light (Tyndall effect).

Original diagram drawn by Simple Learning Hub, based on NCERT Fig 5.3. Report a mistake