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The science behind common everyday phenomena — a high-yield quick reference for competitive exams.
| Observation | Scientific Reason |
|---|---|
| The sky appears blue | Scattering of sunlight by air molecules (Rayleigh scattering) |
| A pressure cooker cooks food faster | Higher pressure raises the boiling point of water |
| Ice floats on water | Ice is less dense than liquid water |
| We see lightning before hearing thunder | Light travels much faster than sound |
| A straw looks bent in water | Refraction of light |
| LPG has a smell | Ethyl mercaptan is added to detect leaks |
| Iron objects rust | Oxidation in the presence of moisture & air |