Glycerol
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Glycerol - a clear, viscous, odourless, slightly sweet, non-toxic, liquid
- used e.g. as a humectant, a solvent, a sweetener, a preservative, a thickening agent
- has some anti-freeze properties
- has a few medical uses
- technically a triol
Glycerol and glycerin (US) / glycerine (UK) refer to the same molecule,
but glycerin is a commercial term that typically refers to mixes that are mostly (>95%) glycerol.
See also:
You may also see the term glycol. Glycol is a wider group, technically the property/grouping of aliphatic diols, where
- aliphatic = non-aromatic
- diol = alcohols with two OH functional groups
Glycols include
- glycerol (E422)
- propylene glycol (E1520 when used for food and E490 when used for cosmetics), somewhat similar to glycerol
- ethylene glycol (used in classical antifreeze, and toxic)
Smoke machine fluids were often basically just glycerol (or other glycols, but not ethylene glycol) and water,
though there appear to be some newer formulations that leave less residue(verify).
Vaping liquid has a base that is often a mix of part glycerin (smoother, cloudier) and propylene glycol.
See also: