Q1
Water boils at:
A100°C
B0°C
C50°C
D212°C on the Celsius scale
CBSEClass 6 (CBSE)ScienceCh 7 · Topic 3
Temperature Scales
Learning about the Celsius and Fahrenheit scales used to measure temperature.
Core concept
To convert between Celsius and Fahrenheit, the formula F = (C × 9/5) + 32 is used; for example, 0°C equals 32°F, and 100°C equals 212°F. The Kelvin scale starts at absolute zero (0 K, equal to -273.15°C), the theoretical lowest possible temperature where all particle motion nearly stops — this makes Kelvin especially useful in physics and chemistry, where negative temperature values would otherwise complicate calculations.
Exam highlight
Key diagram
- Show a thermometer scale marking freezing point (0°C) and boiling point (100°C) of water.
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Quick notes
• Celsius scale: water freezes at 0°C, boils at 100°C.
• Fahrenheit scale: water freezes at 32°F, boils at 212°F.
• Conversion formula: F = (C × 9/5) + 32.
• Kelvin scale starts at absolute zero (0 K = -273.15°C), used in scientific work.