What makes soap so slippery?
Answer:
soap, even the laundry soap, is not reall that much for cleaning. it breaks the barrier between the water and oil; which can't mix. it let's the water rinse out the things on your body, like oil or grease, because if you didn't use soap water would do nothing to wash you. try this. in context that you can see. rub some vasaline on your hands. try to wash it off without soap. the water beads and won't clean them. then try and scrub them with soap. the barrier between the petrolium and the water breaks down and it will wash off. that is basicly the only thing that soap does. it allows water to clean your body when water by itself would not.
They add fat to soap.
Not scientific but.....
Soap is not particularly slippery if it is perfectly dry. Slipperiness is related to the reduced friction between two solid objects (e.g. a bar of soap and the bathroom floor). Friction is a force acting perpendicularly (at a right angle) to the direction of movement, thus making the movement less easy. Two dry, clean, flat objects are very difficult to move against each other i.e. they adhere strongly to each other. As soon as you put a liquid or liquid-like film between the objects, friction is much reduced (Skating takes advantage of this: a water film is created by melting ice under pressure of the skate). The structure of soap molecues is such that, in presence of water, they tend to build up a thin, liquid-like film at the surface of a solid, which allows objects to glide easily against each other.
The molecules is set up in such a way, that half of it dissolves in water and the other half dissolves into your skin. Take a bar of soap when it is dry, it is not slippery. When it is exposed to water, quite a bit is dissolved so it becomes very slippery.
it's the glycerin.
soap molecules dissolves easily in water and slide off the bar onto the skin
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