What kind of explosion has white smoke

The documentary history of the Murrah Building bombing in Oklahoma City in noted "a large black cloud of smoke" emerging; culprit Timothy McVeigh used a explosives made from fertilizer.

Similarly, a survivor of the World Trade Center attack, which employed the class-A high explosive nitrourea. PDF , recalled " greasy black smoke " filling his lungs. Following up on news reports that circulated all day Tuesday, FBI special agent in charge Richard DesLauriers disclosed late Tuesday afternoon that what seems like a "pressure cooker device" formed the hull of the bomb, which may have contained "BBs [and] nails. To be clear, that would not be evidence that the bomb is foreign: designs for such bombs are easy to find online.

Marks saw similar designs in Bahrain, where he analyzed black-powder bombs encased in fire extinguishers. The pressurization, if true, is another potential clue about the bomb's explosive content. Iraq, Afghanistan. These are the kinds of questions he poses to students in the Analysis of Ignitable Liquids and Explosives and Special Topics in Analytical Chemistry classes he teaches, and in the two labs he runs at Boston University.

Off-site, Hall creates mock evidence to be brought back to campus for analysis. He is fond of analogies, and makes good ones.

I asked him what the twelve seconds between blasts suggested to him. On my iPhone, we looked at raw Boston. The loud crack of the first blast was audible, and then came screaming. After listening twice, he watched it. It happens extremely quickly—you see that fireball in the center and then the huge amount of smoke. The captured moment of the blast is invaluable, he said, though the full picture won't become clear until the scientists start working with all the evidence in the lab.

Hall quit the state police six years ago, to teach at B. He had worked too many consecutive cases involving the deaths of children, he said. Do not sell my personal information. Cookie Settings Accept. Close Privacy Overview This website uses cookies to improve your experience while you navigate through the website. Out of these, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website.

We also use third-party cookies that help us analyze and understand how you use this website. These cookies will be stored in your browser only with your consent. You also have the option to opt-out of these cookies. But opting out of some of these cookies may affect your browsing experience. Necessary Necessary. Necessary cookies are absolutely essential for the website to function properly. These cookies ensure basic functionalities and security features of the website, anonymously.

The cookie is used to store the user consent for the cookies in the category "Analytics". The cookies is used to store the user consent for the cookies in the category "Necessary".

This story corrects affiliation of Professor Andrea Sella in Aug. By Reuters Staff 4 Min Read. A view shows damaged buildings near the site of Tuesday's blast in Beirut's port area, Lebanon August 5,