Mystery Behind the Deadly ‘Tsunami of Molasses’

Mystery Behind the Deadly ‘Tsunami of Molasses’

It was January. The place was Boston. And when 2.3 million gallons of molasses burst from a gigantic holding tank in the city’s North End, 21 people were killed and about 150 more were left injured. The wave of syrup — some reports said it was up to 40 feet tall — rushed through the waterfront, destroying buildings, overturning vehicles and pushing a firehouse off its foundation.

For nearly 100 years, no one really knew why the spill was so deadly.

“The historical record says that the initial wave of molasses moved at 35 miles per hour,” Ms. Sharp said, “which sounds outrageously fast.”

“At the time people thought there must have been an explosion in the tank, initially, to cause the molasses to move that fast,” she added. But after the team ran the experiments, she said, it discovered that the molasses could, indeed, move at that speed.

“It’s an interesting result,” Ms. Sharp said, “and it’s something that wasn’t possible back then. Nobody had worked out those actual equations until decades after the accident.”

If the tank had burst in warmer weather, it would have “flowed farther, but also thinner,” Mr. Rubinstein said.

In the winter, however, after the initial burst — which lasted between 30 seconds and a few minutes, Ms. Sharp said — the cooler temperature of the outside air raised the viscosity of the molasses, essentially trapping people who had not been able to escape the wave.

About half the people who were killed “died basically because they were stuck,” Mr. Rubinstein said.

Mr. Rubinstein and Ms. Sharp said they would like to eventually build an entire course around the disaster. Students could apply what they learn in other classes to understanding not just why the molasses behaved the way it did, but also what other forces shaped the events of that day in 1919.

Full article from NYTimes

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