A chapter-wise, continuously updated handbook of key facts, definitions and concepts from the Class 6 NCERT Science textbook (Curiosity, 2026-27 edition). Each section below is added as the corresponding chapter’s Solutions/Extra Questions/Revision Notes are published.
Chapter 1: The Wonderful World of Science (Curiosity)
- Science is a way of thinking — observing, questioning, and finding out by doing.
- Scientific way of thinking: Observation → Questioning → Hypothesising → Experimenting → Analysing.
- Heat changes the state of water: heating causes evaporation, cooling causes freezing.
Chapter 2: Diversity in the Living World
Chapter 3: Mindful Eating: A Path to a Healthy Body
Chapter 4: Exploring Magnets
Chapter 5: Measurement of Length and Motion
Chapter 6: Materials Around Us
- Matter: anything that has mass and occupies space
- Lustre: lustrous (gold, steel) vs non-lustrous (wood, cotton)
- Hardness: hard (iron, stone) vs soft (cotton, sponge)
- Transparency: transparent (glass, water), translucent (butter paper), opaque (wood, metal)
- Solubility: soluble (salt, sugar) vs insoluble (sand)
- Behaviour with water: floats (wood, cork) vs sinks (iron, stone)
- Glass is transparent, not translucent
Chapter 7: Temperature and its Measurement
- Temperature: a reliable measure of hotness/coldness of a body
- Normal human body temperature: 37.0°C (98.6°F)
- Clinical thermometer (digital): measures body temperature; laboratory thermometer: range −10°C to 110°C
- Correct reading: hold vertically, bulb not touching container, read while immersed, eye level with liquid column
- Temperature stays constant while water boils or ice melts
- Scales: Celsius, Fahrenheit, Kelvin (SI unit); Kelvin = Celsius + 273.15
- Absolute zero ≈ −273.15°C (0 K)
Chapter 8: A Journey through States of Water
- States of water: solid (ice/snow), liquid (water), gas (vapour)
- Evaporation: liquid → vapour, continuous even at room temperature
- Condensation: vapour → liquid on a cold surface
- Melting: solid → liquid; Freezing: liquid → solid
- Evaporation speeds up with: higher temperature, larger surface area, more wind, lower humidity
- Evaporation causes cooling (sweating, matka, wet-cloth cooling)
- Water cycle: evaporation → condensation (clouds) → precipitation → collection → repeat
Chapter 9: Methods of Separation in Everyday Life
- Handpicking: manual, for small quantities of visible impurity
- Threshing then winnowing: loosens grain from stalks, then blows away husk with wind
- Sieving: separates solid-solid mixtures by particle size
- Sedimentation then decantation: heavier solids settle, then clear liquid is poured off
- Filtration: removes insoluble solids from a liquid via a porous filter; output is the filtrate
- Evaporation: recovers a dissolved solid (e.g. salt) by turning liquid to vapour
- Churning: agitation separates butter from buttermilk
- Magnetic separation: a magnet pulls out magnetic material
Chapter 10: Living Creatures – Exploring their Characteristics
- Characteristics of living things: movement, growth, nutrition, respiration, excretion, response to stimuli, reproduction
- Seed germination needs: water, air, suitable light/darkness (varies by seed)
- Shoots grow toward light; roots grow downward, regardless of orientation
- Stomata: tiny pores through which plants breathe
- Mosquito life cycle: egg → larva → pupa → adult
- Frog life cycle: spawn → tadpole (with tail) → tadpole (with legs) → froglet → adult
Chapter 11: Nature’s Treasures
- Natural resources: air, water, soil, minerals, forests, sunlight
- Air: mixture of gases, mainly nitrogen (~78%) and oxygen (~21%)
- Renewable resources: replenished naturally in a short time (sunlight, water, air, forests if managed well)
- Non-renewable resources: limited, take millions of years to form (coal, petroleum, minerals)
- Forest roots prevent soil erosion
- Sunlight enables photosynthesis in green plants
Chapter 12: Beyond Earth
- Solar system: Sun + 8 planets + moons, asteroids, comets; Earth is 3rd from Sun
- Constellation: star pattern joined by imaginary lines (e.g. Big Dipper/Saptarishi, Orion)
- Pole Star: appears fixed in northern sky; located via Big Dipper
- Moon reflects sunlight; phases occur as visible sunlit portion changes
- Natural satellite: Moon (Earth’s only one); Artificial satellites: human-made (communication, weather, navigation)
- Milky Way: our galaxy; universe has billions of galaxies
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