How does a jacket act as insulator?
The material of the jacket prevents heat from being lost.
The jacket can create friction to keep your body warm.
The jacket can deflect off cold air.
It helps transfer heat from the outside of the jacket to the inside.

Liquid from a brewery fermentation contains 10% ethanol and 90% water. part of the fermentation product (50,000 kg/h) is pumped to a distillation column on the factory site. under current operating conditions, a distillate of 45% ethanol and 55% water is produced from the top of the column at a rate of one-tenth that of the feed. what is the composition of the waste "bottoms" from the still?