Can whiskey evaporate in a bottle that never has been open?

Whiskey can evaporate in a sealed bottle, but the process is extremely slow due to the airtight nature of the container. If the bottle has been properly sealed and stored upright, the evaporation of alcohol is minimal. However, over long periods, especially if the seal is not perfect, some evaporation can occur, potentially altering the whiskey's flavor and alcohol content.