Why is a glass containing wine is less stable?

A glass containing wine is less stable primarily due to its liquid nature, which can shift and move with motion or external forces. The wine's surface tension and viscosity allow it to slosh, making it susceptible to spilling if the glass is tilted or bumped. Additionally, the design of the wine glass, often with a narrower base, can contribute to an increased risk of tipping over compared to more stable containers.