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tv2nite.jpg(Saturday, January 27th, 2007) DIY has two shows about building tool storage, which is something we all need.  We felt cheated by Underwater Car, as they didn’t actually test how well the two window breaking tools performed with water pressure against the glass.

All times are central.

  • MythBusters: Biscuit Bazooka (Discovery, 6:00 p.m.)
  • Modern Marvels: Logging Tech (History, 6:00 p.m.)
  • MythBusters: Underwater Car (Discovery, 7:00 p.m.)
  • Wood Works: Peruvian Walnut Tool Chest (DIY, 8:00 p.m.)
  • Wood Works: Magazine Storage Boxes (DIY, 8:30 p.m.)
  • Wood Works: Tool Cabinet (DIY, 9:00 p.m.)
  • Freeform Furniture: CD Storage System (DIY, 9:30 p.m.)
  • Unique Whips: Dead Men Walking (Speed, 10:00 p.m.)
  • How It’s Made: Episode 5 (Discovery, 11:00 p.m.)
  • How It’s Made: Episode 6 (Discovery, 11:30 p.m.)



One Response to TV Tonight: Toolbox

  1. I don’t think an external pressure increase from any escapable sunken-car depth will make any difference at all to the breakability of the window. The compressive stress on the surface of toughened glass is in the few-hundred-atmosphere range, which is a LOT. The pressure at the bottom of the 13 foot deep pool the Mythbusters used was less than half an atmosphere higher than the pressure at the surface.

    To get a pressure of a hundred atmospheres, which may still be less than a quarter of the surface compressive pressure of the glass but might still influence its behaviour, you’d need to be slightly more than a KILOMETRE underwater.

    (In which case it doesn’t really matter if you open the window or not.)

    Of course, lots of things that don’t seem plausible on the surface are actually true. But I’d be willing to bet you a good-sized wad of cash that anything that’ll break “safety” glass at zero atmospheres relative pressure will do it just as well with 100 atmospheres pushing one way or the other.

    Heck, there was even a Mythbusters episode a while back in which they demonstrated that pushing by hand on the inside of a car window made no perceptible difference to its breakability.

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