Virtausläm

Virtausläm is a Finnish term that can be translated to "flow lamp" or "lava lamp" in English. It refers to a decorative lighting device that contains a translucent liquid and a solid, colored wax or paste. When the lamp is heated, typically by a light bulb at its base, the wax melts and forms blobs that rise and fall through the liquid, creating a mesmerizing visual effect reminiscent of lava.

These lamps became popular in the mid-20th century and are often associated with psychedelic and retro aesthetics. The movement of the wax is due to convection currents. The wax is denser than the liquid at room temperature, but as it heats up, it expands and becomes less dense, causing it to rise. As it reaches the cooler top of the lamp, it cools, becomes denser again, and sinks back down.

The colors and patterns created by the flowing wax can vary greatly depending on the specific lamp's composition and design. Virtausläms are primarily used for decorative purposes and to create a relaxing ambiance. They are generally safe to operate, although care should be taken to ensure proper ventilation and to avoid placing them near flammable materials. The term "virtausläm" specifically points to its Finnish origin and usage within that cultural context.