Sources of Cold
Hot and Cold: Sources of Cold
Sources of Cold
Sources of Cold
NCERT anchor: NCERT Looking Around Class 1 — Theme: Weather and Seasons (where cold comes from)
What you'll learn
- Ice, cold water, and the fridge are sources of cold.
- Winter weather makes the air outside feel cold.
- Cold keeps food fresh and drinks cool.
Key concepts
1. Ice and the fridge
Level 1 (Verbal): The fridge keeps food and water cold and fresh.
Level 2 (Symbolic): Fridge/ice = made or natural sources of cold.
Visual: An ice cube tray with frost on it.
2. Winter weather
Verbal: In winter, the air outside is cold — we wear sweaters and jackets.
Symbolic: Winter = a cold season; we dress warmly to stay comfortable.
Visual: A child wearing a sweater and cap outdoors.
3. Why we use cold
Cold keeps milk, fruits, and cooked food fresh for longer. Cold drinks feel nice on a hot day.
Worked example
Keeping juice cold for a picnic
Step 1 — Juice bottle is at room temperature.
Step 2 — Place the bottle in the fridge for some time.
Step 3 — Fridge cools the juice — it becomes cold.
Step 4 — Cold juice is packed for the picnic.
Answer: the fridge is the source of cold that cooled the juice.
Common mistakes
| Mistake | Why | Fix |
|---|---|---|
| Thinking ice is always safe to hold long | Ice can feel like it burns if held too long | Hold ice for a short time or use a cloth |
| Mixing up winter and summer clothes | Both seasons need different clothes | Winter = warm clothes; summer = light clothes |
| Thinking cold has no source | Cold also comes from somewhere, like fridge or ice | Fridge, ice, and winter air are cold sources |
Quick check
- Name one thing that gives cold at home.
- What do we wear in winter to stay warm?
- Why do we keep milk in the fridge?
- Stretch: Why does holding an ice cube for too long start to hurt your hand?
Revision tip: Say aloud: 'Fridge, ice, winter air — these give cold, and I dress right for it.'
Open the Practice tab for graded questions on Sources of Cold.
Key Takeaways (TL;DR)
- What you'll learn
- Key concepts
- Worked example
- Common mistakes
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