Bar soap
Bar Soap
Bar soap (pronunciation: /bɑːr soʊp/) is a type of soap that is typically formed into a solid block or bar.
Etymology
The term "bar soap" originates from the English words "bar," meaning a solid, typically rectangular block of a substance, and "soap," a substance used with water for washing and cleaning.
Description
Bar soap is made by combining a base (usually a strong alkali such as sodium hydroxide) with fatty acids. This process, known as saponification, results in a reaction that produces soap and glycerol. The soap is then cooled, cut into bars, and allowed to cure or harden.
Bar soap is used for personal hygiene and cleaning purposes. It is often preferred for its long-lasting nature and environmental friendliness, as it typically requires less packaging than liquid soaps.
Related Terms
- Saponification: The process of making soap by combining a base with fatty acids.
- Base (chemistry): A substance that can accept protons or donate pairs of electrons. In soap making, a strong base such as sodium hydroxide is used.
- Fatty acids: Carboxylic acids with long aliphatic chains, which are either saturated or unsaturated. They are a key component in the making of soap.
- Glycerol: A simple polyol compound that is a byproduct of the saponification process.
- Soap: A substance used with water for washing and cleaning, made by combining a base with fatty acids.
External links
- Medical encyclopedia article on Bar soap
- Wikipedia's article - Bar soap
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