Hinglish

States of Water

Class 6 Science · Chapter 8: A Journey through States of Water · NCERT Curiosity section 8.3

Learn

Water is the only common substance we see in all three states in daily life: solid (ice, snow, hail), liquid (rain, rivers, tap water) and gas (water vapour, invisible in the air).

Solid ice has a fixed shape and a fixed volume. Liquid water has a fixed volume but takes the shape of its container: pour a glass of water into a bowl and it changes shape, not amount. Water vapour has no fixed shape or volume: it spreads to fill all the space available.

(The white cloud you see above a boiling kettle is not water vapour itself: it is tiny drops formed when the invisible vapour cools in the air.)

Explore: which state?

  1. Sort each form of water.

Remember

  • Water exists as solid (ice), liquid (water) and gas (water vapour).
  • Solid: fixed shape and volume. Liquid: fixed volume. Gas: neither.

Quick check

Which state of water has a fixed volume but no fixed shape?

  1. Liquid
  2. Solid
  3. Gas
  4. All three
Answer

Liquid. Liquid water keeps its amount but takes the shape of its container.

Think about it

When ice melts in a glass, does the amount of water change? How could you check?

One answer

The mass stays the same. Weigh a closed container with ice before and after it melts: the reading is the same. The water just changed its state.

Practice

Practise with fresh questions at three levels (easy, medium, hard), some answered hands-on, with hints and worked answers. Get 4 of your last 5 right to finish the topic.