File:Water cannot extinguish burning oil.JPG
Jump to navigation
Jump to search
Size of this preview: 450 × 600 pixels. Other resolutions: 180 × 240 pixels | 360 × 480 pixels | 576 × 768 pixels | 768 × 1,024 pixels | 2,112 × 2,816 pixels.
Original file (2,112 × 2,816 pixels, file size: 1.89 MB, MIME type: image/jpeg)
Captions
Captions
Add a one-line explanation of what this file represents
Summary[edit]
| Description |
English: A few cm3 of water was added to about 10 cm3 of burning cooking oil in a crucible. This caused a huge explosion, because of several facts. First and foremost: water cannot mix with oil, since water consists of polar molecules while oil made of non-polar molecules. Secondly, water has a greater density than oil, so it will descend to the bottom of the crucible. And last but not least: water's boiling point is only 100 degrees Celsius while the burning oil's temperature is more than a few hundred degrees Celsius. Because of these, the water poured into the burning oil will instantly boil, vaporize and expand, thus generating a lot of steam. The large amount of water vapour ejects the already burning oil into the air increasing its surface area dramatically so its combustion can take place much faster. The result is the explosion visible on this picture which was made in a collaboration with my colleague, Ildikó Radnai. This demonstration illustrates in a dramatic way why we should never try to extinguish the flames of burning cooking oil with water. Magyar: Néhány cm3 vizet adtam mintegy 10 cm3 lángoló étolajhoz. Ez egy hatalmas robbanást okozott, ami több dologgal magyarázható. Először is: a víz nem elegyedik az olajjal, hiszen a víz poláris, míg az olaj apoláris molekulákból áll. Másrészt, a víz sűrűsége nagyobb az olajénál, így a víz lesüllyedt az olaj alá. Végül és nem utolsósorban, a víz forráspontja csupán 100 °C, míg az égő olaj hőmérséklete néhány száz foknyi. Ezek miatt az égő olajra öntött víz azonnal felforr, gőzzé válik, kiterjed, ekképp rengeteg vízgőz szabadul fel. Ez a vízgőz a levegőbe repíti az eleve égő olajat, amelynek így drámai módon megnő a felülete, így az égésének a sebessége is jócskán megnő. Ennek az eredménye a robbanás, amelyet megörökítettünk a képen Radnai Ildikó kollégámmal. Ez a demonstráció drámai módon mutatja be, hogy miért ne próbáljunk vízzel égő olajat oltani. English: A small amount of water added to burning cooking oil which resulted in an immense explosion. |
| Date | |
| Source | Own work |
| Author | Sjtanarur |
Licensing[edit]
I, the copyright holder of this work, hereby publish it under the following license:
This file is licensed under the Creative Commons Attribution-Share Alike 4.0 International license.
- You are free:
- to share – to copy, distribute and transmit the work
- to remix – to adapt the work
- Under the following conditions:
- attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
- share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.
 |
This image was uploaded as part of European Science Photo Competition 2015. |
File history
Click on a date/time to view the file as it appeared at that time.
| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 01:45, 29 November 2015 | | 2,112 × 2,816 (1.89 MB) | Sjtanarur (talk | contribs) | User created page with UploadWizard |
You cannot overwrite this file.
File usage on Commons
There are no pages that use this file.
