{"id":310,"date":"2010-08-12T08:38:59","date_gmt":"2010-08-11T20:38:59","guid":{"rendered":"https:\/\/blog.waikato.ac.nz\/physicsstop\/2010\/08\/12\/ice_on_windows\/"},"modified":"2010-08-12T08:38:59","modified_gmt":"2010-08-11T20:38:59","slug":"ice-on-windows","status":"publish","type":"post","link":"https:\/\/blog.waikato.ac.nz\/physicsstop\/2010\/08\/12\/ice-on-windows\/","title":{"rendered":"Ice on windows"},"content":{"rendered":"

 <\/span>No, not ice on car windows<\/a> this time, but ice on aeroplane windows. John Fouhy has sent this question to me, and I don’t know the answer. I have a couple of ideas, but what do you think? Below I reproduce John’s question in full, along with the picture.  Airpoints Gold Card holders, help us out here…<\/p>\n

\"ice_on_window_John_Fouhy.JPG\"<\/i><\/b><\/p>\n

 <\/i><\/b><\/p>\n

 <\/p>\n

 <\/p>\n

 I recently flew into Auckland from Singapore. It was a night flight, so we only opened the windows as we prepared to descend. When we did, I looked outside and noticed ice on the outside window. Well, fair enough, it’s cold outside. But if you look at the photo I attached, there is only a small patch of ice. It’s in the shape of an annulus, centred on a small metal pin. The pin appears to be attached to neither the inner nor the outer surface of the window (I imagine aeroplane windows have many layers).<\/i><\/p>\n

It didn’t take long for the ice to melt in the morning sun. Drops of water remained on the window for a while after, in the same place. So it is possible (from the absence of water elsewhere) that ice did not form elsewhere. <\/i>  [Marcus – I’ve seen this before too – is it something to do with the manufacture process?]<\/b><\/p>\n

As far as I could see, by craning my neck, the next window up from me had the same feature.<\/i><\/p>\n

So my questions, if you have time: Why would ice form only near this metal pin? Why would ice _not_ form even closer to the pin?<\/i><\/p>\n","protected":false},"excerpt":{"rendered":"

 No, not ice on car windows this time, but ice on aeroplane windows. John Fouhy has sent this question to me, and I don’t know the answer. I have a couple of ideas, but what do you think? 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