Physics · Thermal Properties of Matter

Woollen clothes keep us warm in winter. The primary reason for woollens acting as good thermal insulators is that:

Verified Solution4 OptionsUpdated: October 2026👁️1 View

1woollen fibres are thick and physically block external cold air completely
2woollen fibres are thick and actively control the outside temperature
3woollen fibres have air trapped within them, and air is a poor conductor of heat✓
4woollen fibres are tightly wrapped with each other and do not allow cold air to pass

Correct answer

woollen fibres have air trapped within them, and air is a poor conductor of heat

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