1, acetic acid content difference: Degree refers to the percentage of acetic acid in white vinegar. The acetic acid content of 6 degree white vinegar is about 5%~6%, while that of 9 degree white vinegar is about 8%~9%. 9 degree white vinegar contains more acetic acid than 6 degree white vinegar.

2. Difference in bactericidal ability: Acetic acid is a substance with bactericidal effect. At the same concentration, the acetic acid content of 9-degree white vinegar is higher than that of 6-degree white vinegar, and the bactericidal effect of 9-degree white vinegar is relatively strong.