A Spherical Ground Joint Ball is a type of laboratory glassware used to connect two pieces of glassware together. It consists of a spherical glass piece with a ground glass surface that fits into a matching socket, forming an airtight seal.

The ball-and-socket design allows for a range of movement and versatility in connecting different pieces of glassware, making it a commonly used joint in laboratory setups.

The joint is typically used in chemical experiments and is favoured for its ease of use and reliability. The ground glass surface provides a secure, leak-proof seal, ensuring that the experiment is carried out safely and effectively.