Why does vinegar stink?

The pungent smell of vinegar is mainly due to the presence of acetic acid, which is the main component of vinegar. Acetic acid has a sharp and sour odor that can be quite overpowering. When vinegar is produced through the fermentation process, the bacteria or yeast responsible for the fermentation convert the sugars present in the starting liquid (such as apple cider or wine) into acetic acid. The concentration of acetic acid in vinegar can vary, typically ranging from 5% to 10% by volume, which influences the intensity of the smell.

It's worth noting that while acetic acid is the primary contributor to the smell of vinegar, other compounds present in vinegar, such as esters and aldehydes, can also contribute to its overall aroma. These compounds are formed as byproducts of the fermentation process and can add complexity to the vinegar's scent.

It's also important to mention that the perception of smell is subjective and can vary from person to person. Some people may find the smell of vinegar to be unpleasant or overpowering, while others may find it appetizing or refreshing. The tolerance to the smell of vinegar can also be affected by factors such as individual sensitivity and exposure to the substance.