joining

The term "joining" refers to the act of connecting or bringing things together. This can involve physical proximity, such as a condo complex adjoining a golf course. It also encompasses becoming a member of a group, like joining a book club.1

In a more technical sense, joining can mean combining elements to form a new unit, as seen in the formation of a water molecule from oxygen and hydrogen atoms. This concept is fundamental to technologies like adhesives, which hold materials together through surface attachment. Adhesives can be natural or synthetic and work through mechanisms like adsorption, mechanical interlocking, or interdiffusion.12

Another key joining technology is welding, a technique for fusing metallic parts, often using heat. Other methods include fasteners like bolts and screws, which mechanically connect components, and rivets, which are metal pins used to join structural members.345