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 wheel and axle is one of the simple six machines, the others being the lever, the pulley, the inclined plane, the wedge and the screw. Through the looking glass After a demonstration of three simple machines--the lever, the inclined plane (wedge), and the axle--the children were up for the task. Little people + simple machines = future engineers + big jobs The screw is actually an inclined plane or wedge that's wound spirally around a cylinder in a helical form.