Middle notes, also known as heart notes, are the scents that emerge after the initial top notes of a fragrance have evaporated. They typically appear about 10 to 30 minutes after application and can last for several hours. Middle notes are crucial in defining the character of a perfume, as they create a bridge between the top and base notes. Common middle notes include floral scents like rose and jasmine, as well as fruity notes like peach and pear. These notes are often more rounded and fuller than top notes, providing depth and richness to the overall fragrance. They play a significant role in the overall experience of a perfume.