Definition of common for Students. 1  1 : affecting, belonging to, needed by, or used by everybody for the common good a common room. 2  2 : shared by two or more individuals or by the members of a family or group a common ancestor. 3  3 : 1general 1 common knowledge. 4  4 : occurring, appearing, or used frequently a common sight a common name.
1 Apple cider vinegar is highly acidic. 2  The main ingredient is acetic acid, which is quite harsh. 3  You should always dilute it with water or juice before swallowing. 4  Pure, straight apple cider vinegar could damage your tooth enamel or the tissues of your mouth and throat. Apple cider vinegar is highly acidic. 2  The main ingredient is acetic acid, which is quite harsh. 3  You should always dilute it with water or juice before swallowing. 4  Pure, straight apple cider vinegar could damage your tooth enamel or the tissues of your mouth and throat.
The pH of vinegar depends upon how much acid is present in it. The most commercial distilled white vinegars contain 5% acetic acid, and hence, has a pH value that ranges between 2.40 - 3.40. More Information on Vinegar and its pH Levels. Though vinegar is available in different varieties, apple cider vinegar is the most commonly used example, which is prepared from apple cider.