這是一個天氣瓶，在溫度開始變冷的時候（大約23度左右）就會開始出現一些雪花形狀的結晶，其實是一些融在溶液裡的樟腦，隨著溫度的上升和下降，樟腦慢慢從溶液的狀態結晶，構成一種雪花狀的結晶，超漂亮的。
this is a storm glass ,when temperature drop(around 23 degree) some crystal will be formed with the shape of snowflake . Actually they are crystal of camphor ,when the temperature drop slowly ,it will crystalise better and have a beautiful shape of snowflake.
