Question

Learn more about the three phases of matter. Make a presentation explaining the different processes involved in change of phase. Provide examples of each process. Verify each process in terms of real-life scenarios.

Answer 1

1. The Three Phases of Matter

• Solid: Definite shape and definite volume. Particles are tightly packed together.
• Liquid: Indefinite shape but definite volume. Particles are loosely packed and can flow.
• Gas: Indefinite shape and indefinite volume. Particles are far apart and move rapidly.

2. Processes, Examples, and Real-Life Scenarios

A. Solid ↔ Liquid

• Melting: Solid changes into liquid by absorbing heat.
  • Example: Ice turning into water.
  • Real-life Scenario: An ice cream melting quickly when taken out of the freezer on a hot summer day.
• Freezing: Liquid changes into solid by releasing heat.
  • Example: Water turning into ice cubes.
  • Real-life Scenario: Water freezing inside pipelines and blocking them during harsh winters in extremely cold regions like Ladakh.

B. Liquid ↔ Gas

• Vaporisation/Evapouration: Liquid changes into gas (vapour).
  • Example: Water boiling to form steam.
  • Real-life Scenario: Wet clothes drying out in the sun as water evaporates directly into the air.
• Condensation: Gas or vapour cools down to change into liquid.
  • Example: Steam cooling down back into water.
  • Real-life Scenario: Tiny water droplets forming on the outer surface of a cold glass because the moisture in the surrounding air cools down upon touching it.

C. Solid ↔ Gas

• Sublimation: Solid changes directly into gas without turning into liquid first.
  • Example: Camphor or naphthalene (mothballs).
  • Real-life Scenario: Mothballs placed in a clothing wardrobe shrinking and disappearing over time without ever making the clothes wet.
• Deposition: Gas changes directly into solid without turning into liquid first.
  • Example: Formation of frost.
  • Real-life Scenario: Water vapour in the air turning directly into a thin layer of ice (frost) on grass or car windscreens during freezing winter nights.