Everyday physics and chemistry
Science in daily life: force, energy, light, electricity, matter and reactions.
Key facts
- Units: force (newton), energy (joule), power (watt), current (ampere).
- Sound cannot travel through a vacuum; light travels at about 3 × 10⁸ m/s.
- pH below 7 is acidic, 7 is neutral, above 7 is basic; lemon juice is acidic, soap is basic.
- Water boils at 100 °C and freezes at 0 °C at normal pressure.
- Rusting needs both oxygen and moisture.
Practice questions
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