Why Does Butter Melt At Room Temperature?
Butter is a solid fat at cold temperatures because the fatty acid molecules in it are tightly packed together. However, at room temperature, the kinetic energy of the molecules increases which causes them to move apart. As a result, the solid butter begins to soften and eventually melt. The melting point of butter is around 90°F (32°C), which is why it will typically begin to soften and melt once it has been left out at room temperature for a while.