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🧪 Lab 7 of 19 · Science Lab - Advance 2 · Class 9

Experiment 6 — Archimedes and the Crown

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Topic: Physics · Class 9 · Gravitation: thrust, buoyancy and density

Aim: Find out whether the crown is pure gold by measuring its relative density.

Daily: Archimedes solved this problem for a king in his bath. Today the same idea tells a dairy inspector whether milk has been watered down, using a lactometer, and keeps ships afloat by design.

Question: Why does an object seem lighter when weighed under water?

Exp: That upward thrust is Archimedes’ principle.

Exp: It is a ratio of two densities.

Question: An object floats when its density is…

Exp: Then the buoyant force can balance its weight.

Question: Apparent loss of weight in a liquid equals…

Exp: Which equals the weight of displaced liquid.

Question: A lactometer checks milk by measuring its…

Exp: Added water lowers the relative density.

All activities in Science Lab - Advance 2

  1. Part 2 — Chemistry
  2. Experiment 1 — Read the Motion Graph
  3. Experiment 2 — Stop Before the Cow
  4. Experiment 3 — Force, Mass and Acceleration
  5. Experiment 4 — The Recoiling Cannon
  6. Experiment 5 — Hammer and Feather
  7. Experiment 6 — Archimedes and the Crown
  8. Experiment 7 — Over the Hill
  9. Experiment 8 — Sound the Ocean Floor
  10. Experiment 9 — From Ice to Steam
  11. Experiment 10 — Solution, Colloid or Suspension?
  12. Experiment 11 — Unmix the Ink
  13. Experiment 12 — Where Did the Mass Go?
  14. Experiment 13 — Build an Atom
  15. Experiment 14 — The Potato Osmoscope
  16. Experiment 15 — Who Does What in the Cell?
  17. Experiment 16 — Name That Tissue
  18. Experiment 17 — Beat the Pests, Keep the Grain
  19. Experiment 18 — Run a Dairy

Practise for Class 9