Solar Radiometer

The Crookes Radiometer stands 20cm tall encased in clear glass, showcasing a fascinating scientific principle.

Inside, lightweight vanes spin when exposed to light due to thermal transpiration—where air molecules move more rapidly on the heated black surfaces than the cooler white sides. This creates a pressure difference that causes the vanes to rotate, illustrating the conversion of light energy into motion.

Perfect for demonstrating concepts of thermodynamics and radiation, this elegant instrument blends art with physics in a clear, captivating display.

A stunning piece at an excellent price from a reputable UK based company.