1000 millimeters in an inch

This entry was published at least two years ago (originally posted on September 22, 2004). Since that time the information may have become outdated or my beliefs may have changed (in general, assume a more open and liberal current viewpoint). A fuller disclaimer is available.

Okay, I know that the US has, as a whole, been resisting switching over to the metric system (a real shame in my opinion). But still — you’d think that the Department of Homeland Security would be a little more informed than they appear to be

Is there a particular type (brand) of duct tape that citizens should buy?

The Federal Emergency Management Agency recommends using duct tape with a minimum thickness of 10 millimeters (0.01 in).

What is the most effective type of plastic sheeting?

FEMA recommends using plastic sheeting with a thickness of 10 millimeters (0.01 in.).  For reference, commercially available sheeting is typically sold at 0.7, 1, 1.2, 1.5, 2, 2.5, 3, 4, 6 and 10 millimeters. But, keep in mind that any type of plastic sheeting, even heavy trash bags, can be better than nothing.

[…]

What is the science behind the recommendation to seal off rooms?

Duct tape was tested as part of a study on chemical protective clothing materials. In this study, it was concluded that duct tape provided at least a temporary seal against permeation by simulants of common chemical agents, including GB, VX, mustard and pesticides.  Depending on the chemical agent, duct tape resisted permeation for 3 ½ hours to more than 24 hours.  The study tested duct tape of 10 mil (0.01 in.) thickness.  Plastic sheeting was tested as part of a test using live chemical warfare agents conducted at the Chemical Defense Establishment in Porton Down, England in 1970.  Agents tested included H and VX.  Sheeting of various thickness was tested, including 2.5 millimeters (0.0025 in.), 4 millimeters (0.004 in.), 10 millimeters (0.01 in.) and 20 millimeters (0.02 in.).

For the curious, using Google‘s handy dandy little calculation function, here’s the real numbers:

Of course, maybe I’m working from the wrong assumption. Maybe the Government just needs to smack Google around and tell them to get their math right…

(via Rick)

iTunes “Disco Inferno (Soul Solution)” by Lauper, Cyndi from the album Disco Inferno (1999, 7:52).