NCERT Solutions Curiosity Chapter 8 Fig. 8.5 Conversion of different states of water — Activity 8.6: Let us complete the diagram
Book page 152 Updated on2026-09-05
Q1.
Fill up the blank boxes in Fig. 8.5 marked as A, B, C and 1, 2, 3, 4 for conversion of different states of water using the words given in the box. Two words have been filled for you. [Liquid, Freezes, Evaporates, Gas, Condenses]
Answer
The completed diagram:
Fig. 8.5 completed. The green arrows (going right) all need heat to be supplied; the blue arrows (going left) all need heat to be removed.
Blank
Answer
What it means
A
Solid (already filled — ice)
Water in its solid state
B
Liquid
Water in its liquid state
C
Gas
Water vapour, the gaseous state
1
Melts (already filled)
Solid → Liquid, on heating, at 0 °C
2
Evaporates
Liquid → Gas, on heating
3
Freezes
Liquid → Solid, on cooling, at 0 °C
4
Condenses
Gas → Liquid, on cooling
How to place the words without guessing: box 1 Melts is given and it sits on the arrow from A (Solid) to B, so B must be Liquid. Then the only remaining state word is Gas for C. Arrow 2 goes from liquid to gas, so it is Evaporates; arrow 3 comes back from liquid to solid, so it is Freezes; arrow 4 comes back from gas to liquid, so it is Condenses.
Tip: Remember the pairs — melting and freezing are opposites (both at 0 °C for water), and evaporation and condensation are opposites. In each pair, one takes heat in and the other gives heat out.