- Function and benefits This weather forecast bottle detects temperature changes and shows weather through crystal patterns. No electronics are required, and the changing crystals provide a clear, visual indication of conditions. The item also serves as a decorative display. - Construction and materials The solution is contained in a glass container and consists of several chemicals. The glass construction allows easy viewing of the crystal changes from all angles. - How it behaves by weather On sunny days, the filling sits at the bottom and the upper liquid is clear. When the weather shifts from sunny to cloudy, the filling rises and forms visible layers. On cloudy days, the filling floats higher and the liquid becomes more turbid. - Size and compatibility Size and dimensions are not specified. Designed as a compact tabletop display suitable for home, office, or classroom use. - Use scenarios 1) Desk or office decor that also function as a simple weather indicator. 2) Classroom or science demonstration to illustrate temperature-related crystal changes. 3) Gift for weather enthusiasts or those who appreciate unique decorative items.