Category: 繼續購物
這款迷人的物理玩具將光轉化為動能。由化學家威廉·克魯克斯爵士於1873年在化學研究中意外發明，輻射計由一個玻璃球體和內部四片雙色葉片組成。球體內的空氣已被抽空，形成部分真空狀態，使葉片能在中央主軸上自由旋轉。
當暴露於陽光、人造光源甚至熱源時，葉片便開始旋轉——暗面遠離輻射源，亮面則朝其前進。
嘗試不同的能量來源，觀察輻射計內部葉片轉動速度的變化。對於不了解其科學原理的人來說，這種運動宛如魔法。簡單的解釋或許能揭開謎團，但當你更深入思考其中的熱力學原理時，這份驚奇感反而會更加深刻。
I set it on my desk near a window and it's been spinning nonstop all afternoon, which is weirdly hypnotic to watch while I work. The glass bulb is heavier than I expected, so it doesn't feel like it'll tip over easily.
The vanes actually spin faster under direct sunlight than under my desk lamp, which I wasn't expecting. Watching it slow down as a cloud passes is oddly hypnotic, and it's held up fine on the windowsill for a few weeks now.
My kids fight over who gets to hold it up to the lamp, and honestly I don't blame them. The glass bulb feels solid in the hand, and watching those little vanes spin faster the closer you bring it to the window never gets old.
