Angora vs Merino vs Silk

This is something I have wondered about for a while. What is the difference in volume between Angora wool and other fibers. Different types of fibers have different thickness (measured in microns) but also different density, and different mass. What that means is that an ounce in weight will actually give you different amounts of fiber for your projects. In the extreme, a pound of shoe laces vs a pound of metal chain will yield you two very different lengths of those products. When choosing what fiber to use in your project, plenty of other factors will play into deciding what you wish to use. Sheep wool has superior elasticity to angora or silk and is better suited for projects in which you want to use a more bouncy yarn. But if all you care about is making something soft, which of the soft fibers do you pick? Of course the other consideration is cost. Ethically collected Angora is a very labour intensive and hands on process. Majority of commercial mills can not process Angora b...