This video is not available for purchase in your country.

Mercury iodide tornado demonstration

K004/1949

Rights Managed

This video is not available for purchase in your country.

Please contact your Account Manager if you have any query.

Credit

RHYS LEWIS & MINH TAN PHAM, AHS, DECD, UNISA / SCIENCE PHOTO LIBRARY RHYS LEWIS & MINH TAN PHAM, AHS, DECD, UNISA / SCIENCE PHOTO LIBRARY

Caption

High-speed footage of the mercury iodide tornado demonstration. The beaker contains a solution of potassium iodide, with a vortex created by a magnetic stirrer. Mercury (II) chloride is added to the centre of this vortex. This forms an insoluble precipitate of yellow rhombic mercury (II) iodide, which rapidly undergoes a modification to orange tetragonal mercury (II) iodide. As the mercury iodide is spun away from the vortex it encounters a greater concentration of potassium iodide, and it forms colourless potassium tetraiodomercurate, which dissolves again. The equations for the reactions are:

HgCl2 + KI --> HgI2 + KCl
HgI2 + KI --> K2[HgI4].

Release details

Model release not required. Property release not required.

Downloadable Master

  • Duration: 00:00:37.04
  • Audio: No
  • Format: Photo - JPEG
  • Frame Rate: 25.000

Original

  • Codec: H.264
  • Interlaced: No
  • Frame Size: 1920 x 1080

Contact us if you require the original or other formats.

 {{ i.shot_duration ? i.shot_duration + ' ' : '' }}{{ i.shot_uhd ? '4K ' : i.hires ? 'HD ' : '' }}{{ i.spl_number }} R{{ i.license }}

  • basket icon
  • Calculate price calculator icon
  • Add to board lightbox icon