Why Don’t Sheep Shrink In The Rain?

The video explains why wool sweaters shrink in the laundry but sheep wool doesn't shrink in the rain. Wool fibers have scales that create friction, causing them to move in one direction, leading to shrinkage when agitated in water and heat. Sheep wool doesn't shrink because it isn't agitated enough in the rain to activate the ratchet effect.

Why don't sheep shrink in the rain despite being made of wool?

• Sheep's wool is naturally waterproof.

• Sheep's wool is different from wool used in sweaters.

• Sheep have a special oil that prevents shrinkage.

• Sheep's wool doesn't get tossed around enough to shrink.

What characteristic of wool fibers makes them slide more easily in one direction?

• Their thickness

• Their elasticity

• Their overlapping scales

• Their smooth surface

How does water contribute to the shrinkage of wool in the laundry?

• By increasing the temperature

• By making the fibers more elastic

• By causing the fibers to swell and scales to soften

• By washing away natural oils

What effect does heat have on wool fibers during washing?

• It makes the fibers more rigid.

• It causes the fibers to lose color.

• It makes the fibers more bendy, increasing contact.

• It reduces the size of the scales.

Why does the ratchet effect not cause sheep's wool to shrink in the rain?

• The scales are too hard to catch on each other.

• The wool is not agitated enough.

• The fibers are not in close contact.

• The rainwater is not hot enough.