The main difference between a bar sink and a kitchen sink is that a bar sink is smaller. A typical bar sink is about 15 inches wide, while a kitchen sink is about 22 inches wide. The smaller size of a bar sink makes it more convenient for cleaning glasses and other small items. Another difference between a bar sink and a kitchen sink is that a bar sink has a lower profile. This means that the basin of the sink sits lower on the countertop, making it easier to reach over and rinse things off.