Glycerin. Glycerin is an ingredient that can be found in many beauty products because of its moisture locking properties. It is a form of sugar alcohol that is available naturally in vegetable oils and can also be the byproduct of soap making.
Definition of wheel and axle : a mechanical device consisting of a grooved wheel turned by a cord or chain with a rigidly attached axle (as for winding up a weight) together with the supporting standards
Examples of Wheel and Axle: The large disc is the wheel, and the small cylinder or rod is the axle. There may be two wheels attached to the axle like in the image to the left, or it could be a single wheel and axle. The wheel is one of the greatest inventions in history, but it does not work without the axle.