Here's why:
* Solid Structure: Lip balm is typically made from waxes, oils, and other ingredients that solidify at room temperature.
* Low Melting Point: These ingredients are chosen for their low melting points so that they melt easily on your lips, providing a smooth, hydrating feel.
* Body Heat Effect: When you apply lip balm, the heat from your lips can melt the waxes and oils, making it feel soft and spreadable.
So, lip balm is technically a solid, but it's a solid that easily changes state due to its low melting point and the effect of body temperature.