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Matter in Our Surroundings — Question 4

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Question 4

Why are we able to sip hot tea or milk faster from a saucer rather than a cup?

Answer

Evaporation is a surface phenomenon. If the surface area is increased, the rate of evaporation increases. The surface area of a saucer is more than a cup, hence rate of evaporation is greater in a saucer than in a cup. As evaporation causes cooling, so hot tea or milk gets cooled quickly in a saucer than in a cup enabling us to sip it faster.

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Science | Chapter 1: Matter in Our SurroundingsWeb Content — Quick Reference

Chapter 1: Matter in Our Surroundings — Quick Reference

states of matter particle nature change of state evaporation latent heat melting boiling sublimation

Quick Revision Points

  • Matter has mass and occupies space; made of particles with spaces, motion, and attraction
  • Three states: Solid (fixed shape/volume), Liquid (fixed volume, not shape), Gas (neither fixed)
  • Melting point of ice = 0°C (273 K); Boiling point of water = 100°C (373 K)
  • Latent heat of fusion of ice = 334 J/g; Latent heat of vaporisation of water = 2260 J/g
  • Sublimation: solid → gas directly (camphor, dry ice, naphthalene)
  • Evaporation: surface phenomenon at all temperatures; causes cooling; factors: surface area, temperature, humidity, wind
  • Temperature conversion: T(K) = T(°C) + 273
Exam Tips for Chapter 1
  • Read the detailed chapter notes for complete coverage of all NCERT topics.
  • Practice all NCERT in-text and back exercise questions — they are frequently asked in exams.
  • Focus on comparison tables, diagrams, and definitions — these are high-scoring areas.
  • For numericals (if applicable), practice at least 20 problems of varying difficulty.
  • Refer to the practice question bank (200+ questions) for thorough preparation.
Related Resources
  • Detailed Notes: ch01-matter-in-our-surroundings.html
  • Practice Questions: 100+ questions with answers in 05-practice-questions/
  • Chapter Test: 30-mark test paper in 06-tests/chapter-tests-30marks/
  • Formula Sheet: Complete formula reference in 03-teacher-aid/formula-sheet.html
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