Is bubble level vial one of the components of spirit bubble level?

Yes, the bubble level vial is a key component of a spirit bubble level (often simply called a “spirit level” or “bubble level”).

Bubble Level Vial: This is a sealed, transparent tube, usually made of glass, acrylic, or plastic, that contains a liquid (often alcohol or a similar clear fluid) and a small air bubble. The position of the air bubble relative to markings on the vial indicates whether a surface is level.

Spirit Bubble Level: This is the complete tool, which includes one or more bubble level vials mounted into a frame. The frame can be made of various materials, such as plastic, metal, or wood, and often has edges designed to rest or align against surfaces. Some spirit levels have multiple vials oriented in different directions to measure horizontal, vertical, and sometimes 45-degree angles.

In essence, the bubble level vial is the functional component that allows the spirit level to measure flatness or alignment.