If one was to boil a wool jacket it would more than likely shrink to quite a small size. It can be pulled back in to shape by stretching the material whilst wet.
Wool is very durable - a good weave out of high quality wool can create a piece of fabric that will last a decade or better if cared for properly.
wool!
Wool holds lot of air. As air is a bad conductor of heat, this makes the wool a bad conductor of heat, but a good insulator.
Steel wool can ignite when exposed to high heat, such as from a heating vent, because of its fine and flammable nature. It can catch fire and potentially lead to a hazardous situation. It's important to keep flammable materials away from heating vents to prevent accidents.
Wool is considered one of the best heat insulating fabrics due to its natural properties that trap air, creating a barrier against heat loss. Other good heat insulators are fleece and down feathers, which have a high loft and trap warmth effectively.
wool
yes it is because wool has air pockets which keep in all the heat and block out the conduction of heat, convection and radiation.
wool is a insulator
yes and no it depends on what wool and what you want to insulate ?
As wool keeps you warm and retains body heat
If you soak steel wool in oil, it can become a fire hazard since the oil can make the steel wool heat up more quickly and reach its ignition temperature. It is not recommended to soak steel wool in oil due to this risk.
Silk is well known for being warmer than wool. Nylon and cotton are poorer insulators. (As well, there are other types of "wool" which are known for being much warmer than sheep's wool...)