What is Soap: Definition and 103 Discussions

Soap is a salt of a fatty acid used in a variety of cleansing and lubricating products. In a domestic setting, soaps are surfactants usually used for washing, bathing, and other types of housekeeping. In industrial settings, soaps are used as thickeners, components of some lubricants, and precursors to catalysts.
When used for cleaning, soap solubilizes particles and grime, which can then be separated from the article being cleaned. In hand washing, as a surfactant, when lathered with a little water, soap kills microorganisms by disorganizing their membrane lipid bilayer and denaturing their proteins. It also emulsifies oils, enabling them to be carried away by running water.Soap is created by mixing fats and oils with a base, as opposed to detergent which is created by combining chemical compounds in a mixer.
Humans have used soap for millennia. Evidence exists of the production of soap-like materials in around 2800 BC in ancient Babylon.

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  1. S

    Calculating Time it Takes for Soap to Slide Down a Ramp

    A wet bar of soap slides freely down a ramp 9.35 m long inclined at 7.00°. How long does it take to reach the bottom? Assume muk = 0.0550. Okay I've got my x & y componants 9.35cos(7)=9.28 9.35sin(7)=1.14 But now what since I don't have the mass of the soap or the acceleration, what do I...
  2. E

    Understanding the Pressure Inside a Soap Bubble

    Show that inside a soap bubble, there must be a pressure \Delta P in excess of that outside equal to \Delta P = 4 \gamma /r where r is the radius of the buble and \gamma is the surface tension. My first question is: The pressure on what!? Are they referring to the pressure on the bubble...
  3. Hydr0matic

    Exploring the Mysterious Rainbow Patterns of a Soap Bubble

    To know what I'm talking about you'll have to do a little experiment... Go to your bathroom, take some soap and foam up your hands. Make a "bubble" with your index finger and your thumb, then reflect the light from a lamp in the "bubble". After a little while oil-like rainbowcolored patterns...
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