Bottled alcohol should not be destroyed if it is sealed all the time, but the seal is not a permanently closed indoor space design, and its shelf life should be calculated to the time when the package can ensure relative sealing;
Under saturated steam at room temperature, with the passage of time, the alcohol in it is more volatile than water, and the decrease of concentration value leads to the failure to achieve the expected antibacterial effect.
Extended data:
Alcohol molecules have two ends, one of which is hydrophobic (-C2H5), which can destroy the attraction between hydrophobic groups in protein. One end is hydrophilic (-OH), but it is difficult to destroy the attraction between hydrophilic groups outside protein. On the other hand. Although water molecules can relax the attraction between hydrophilic groups in protein, even if they enter bacteria, they cannot destroy the attraction between hydrophobic groups in protein.
Baidu encyclopedia-medical alcohol