We appreciate your support on https://www.patreon.com/MinuteEarth
Getting wet isn’t REALLY what makes wool shrink; it merely exacerbates the friction between the wool fibers, which is stronger in one direction than another, so when agitated in the washer or dryer, they migrate in relation to each other in a process called “felting.”
To learn more about this topic, start your googling with these keywords:
Fiber: a threadlike structure forming part of the muscular, nervous, connective, or other tissue in the human or animal body
Felting: the process by which wool or another textile can be agitated, often along with moisture or heat, to cause the fibers to migrate amongst themselves and mat together into a dense smooth surface
Ratchet: a device consisting of a bar or wheel with a set of angled teeth that allow motion in one direction only
Wool: soft curly or wavy hair forming the coat of a sheep or similar animal, especially when cut off the animal & prepared for use in making cloth or yarn
Mammal: a warm-blooded, bony, & hairy/furry animal, the females of which give birth to live young and nurse them with milk
Credits (and Twitter handles):
Script Writer: Emily Elert (@eelert)
Script Editor: Alex Reich (@alexhreich)
Video Illustrator: Qingyang (@QCVisual)
Video Director: Henry Reich (@MinutePhysics)
Video Narrator: Kate Yoshida (@KateYoshida)
With Contributions From: Ever Salazar, Peter Reich, David Goldenberg
Music by: Nathaniel Schroeder: http://www.soundcloud.com/drschroeder
Like our videos?
Subscribe to MinuteEarth on YouTube: http://goo.gl/EpIDGd
Support us on Patreon: https://goo.gl/ZVgLQZ
Also, say hello on:
And find us on itunes: https://goo.gl/sfwS6n
If you liked this week’s video, we think you might also like:
Is it Better to Walk or Run in the Rain? https://www.youtube.com/watch?v=3MqYE2UuN24
Gupta, N. P., Agarwal, R., & Pant, S. (2009). Factors affecting felting of wool: An overview. Colourage, 56(1).
Johnson, N. A., & Russell, I. (Eds.). (2008). Advances in wool technology. Elsevier. https://goo.gl/vZ9eCn
Makinson, K. R. (1972). The Role of the Scales of Wool Fibers in Felting and in Shrinkproofing. Wool Sci. Rev, (42), 2-16.
Makinson, K. R. (1979). Shrinkproofing of wool (Vol. 8). M. Dekker. Chicago.
Menkart, J., & Speakman, J. B. (1945). Scaliness of Wool Fibres. Nature, 156, 143-143. http://www.nature.com/nature/journal/v156/n3953/abs/156143a0.html
van der Vegt, A. K. (1955). A study on the mechanism of wool felting. Excelsior.
Tagged under: MinuteEarth,Minute Earth,MinutePhysics,Minute Physics,earth,history,science,environment,environmental science,earth science,wool,wool science,sheep,flying sheep,rocket sheep,natural fibers,natural clothing,wool sweater,shrink,felt,felting
Clip makes it super easy to turn any public video into a formative assessment activity in your classroom.
Add multiple choice quizzes, questions and browse hundreds of approved, video lesson ideas for Clip
Make YouTube one of your teaching aids - Works perfectly with lesson micro-teaching plans
1. Students enter a simple code
2. You play the video
3. The students comment
4. You review and reflect
* Whiteboard required for teacher-paced activities
With four apps, each designed around existing classroom activities, Spiral gives you the power to do formative assessment with anything you teach.
Carry out a quickfire formative assessment to see what the whole class is thinking
Create interactive presentations to spark creativity in class
Student teams can create and share collaborative presentations from linked devices
Turn any public video into a live chat with questions and quizzes