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
The axle has a smaller radius than the wheel.A wheel-and-axle is a complex lever system, with the center of the wheel-and-axle serving as the fulcum. The radii of the two parts are the arms of a lever. A lever is more efficient than a wheel-and-axle because a lever does not need to overcome the force of friction.