Credit: SCIENCE PHOTO LIBRARY MOTION

Caption: Sequence of clips showing the endothermic reaction between barium hydroxide and ammonium chloride. A beaker containing the two chemicals is set on a block of wood dampened with water. As the sequence starts, the chemicals are mixed with the probe of a digital thermometer and there is a dramatic drop in temperature from 22C to 5C. At 7 seconds the view moves to a top-down look into the beaker and the chemicals starting to form a slush. At 10 seconds we return to the thermometer that is now reading -5C. At 28 seconds we move to a wide shot of the experimental set up. The temperature has reached -19C. At 34 second, a technician lifts the beaker to show that the damp wooden block has frozen to it.

Release details: Model release not required. Property release not required.

Keywords: 40 seconds, aluminium chloride, barium hydroxide, beaker, chemical, chemicals, chemistry, clip, clips, cold, complete, demonstration, digital thermometer, dynamics, end, endothermic, experiment, freezing, heat, inorganic, loss, mix, mixing, mixture, rapid, reaction, sequence, slush, story, thermodynamics, transfer, wooden block

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Endothermic mixing reaction

K003/8999 Rights Managed

Downloadable master

Duration: 00:00:40.16

Frame size: 1920x1080

Frame rate: 25

Audio: No

Format: QuickTime, Photo JPEG 100%, progressive scan, square pixels

File size: 1.6G

Original

Capture format: DSLR - AVCHD

Codec: H.264

Please contact Science Photo Library if you require the original, or other formats.

 

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