Here’s a cool toy. This radiometer spins when exposed to a light source. It’s tempting to think that photons are imparting the spinning force on the vane directly. Photons do exert force - though massless, they have intrinsic momentum - but that radiation pressure is far too weak to move something like this.
What’s really happening: the black panels absorb energy from the incident light and heat up. The gas (air I presume) molecules knocking about actually kick off from those panels more strongly due to this heat. The vane thus turns only in then direction of the white panels, which absorb much less energy and thus transfer less to colliding particles. It is the kinetic force of the air particles responsible, not the electromagnetic force of the photons.
I’ll post a video when I get the chance!