What happens to ice in a glass when you leave it for a hour?

When you leave ice in a glass for an hour, it begins to melt due to the surrounding warmer temperature of the liquid and the air. As the ice absorbs heat, it transforms from solid to liquid, resulting in cold water accumulating in the glass. Eventually, the ice will continue to melt until it either completely dissolves or reaches an equilibrium with the temperature of the surrounding environment. The overall effect is that the drink becomes colder, and the amount of ice decreases over time.