Höyrykasvatusmuna

Höyrykasvatusmuna, which translates to "steam growing egg" in Finnish, refers to a type of toy designed for children. These toys typically consist of a plastic egg-shaped casing that contains a small figurine. When the egg is placed in water and heated, usually by steam generated from the water, the plastic casing softens and expands, gradually revealing the figurine hidden inside. This process simulates a hatching or growing effect.

The concept is similar to other "grow" toys where an object expands when submerged in water, but the steam element adds a unique dimension to the experience. The toys are generally intended for younger children and are often marketed as a fun and educational activity. They can provide a visual demonstration of a simple chemical process, albeit a simplified one. Safety precautions are usually advised, such as adult supervision during the heating process, to prevent burns. The complexity and type of figurine vary widely among different manufacturers and models of höyrykasvatusmuna. They are often found in toy stores and online retailers catering to children's products.