In fact, we could use this velocity measurement to infer when ... As you add solids to the melt, the viscosity will increase up to 3x. The photos and video of the lava flow suggest the lava ...

Figure 1: Falling-sphere viscosity measurement using ultrafast X-ray ... corrected objective lens (numerical aperture=0.14). Images were captured with a high-speed camera (Photron FASTCAM SA3).