Traditional Culture Encyclopedia - Travel guide - Why don't many soap boxes on the market have lids?

Why don't many soap boxes on the market have lids?

Why don't many soap boxes on the market have lids? Because soap is in contact with drinking water every day, it will melt in the process of contact. If covered, it will melt faster. If it is not covered, its temperature will drop and the soap will melt more slowly. This is the most basic principle!