Dirty Harry Posted 25 February Share Posted 25 February Need some help with me maths i was reading a wfa article about Ypres in 1915. They used 6000 cylinders to produce 160 tons of chlorine, which I get, but the article went on to say this produced 1part gas to 1000 part ambient air. How did they arrive at this number? thanks paul Link to comment Share on other sites More sharing options...

JMB1943 Posted 27 February Share Posted 27 February WFA says concentration is 1 in 1000, this is 1000 parts per million (ppm). My approach to determining this would be as follows. Let’s start with what we know, 160 Tons Chlorine = 160 x 2240 x16 ounces = 160 x 2240 x 16 x 28 = 160,563,000 grams; call that 161,000,000 grams So concentration of chlorine at the front lines = Weight chlorine / Weight air at front lines Volume air at frontline = Length x Height x Depth [L x H x D] We will take 1 yard = 1 meter, and you will have to look up the length over which chlorine was released = L Now have to make some assumptions, Assume Height = 6 feet = 2 meters to cover soldiers in trench or running on surface. Assume gas cloud covers ground from front line trench to where?? This is the depth = D So what is the depth? Distance between front line trench and support trench? = D1 OR Distance from frontline trench to halfway to support trench? = D2 OR Y yards only past the trench? = D3, Then V = L x 2 x D where D = D1 or D2 or D3 or any other value that you choose. So Mass of air = V x density = L x 2 x D x 1.293 ; call that 1.3 grams per liter. So concentration, C = 161,000,000 / (L x 2 x D x 1.3) Suppose C = 0.0003, this is 0.03%, which is 0.03 x 10,000 ppm = 300 ppm. Regards, JMB PS If we take WFA estimates as true, can calculate D if we know L. Link to comment Share on other sites More sharing options...

Dirty Harry Posted 8 March Author Share Posted 8 March (edited) brilliant piece of work, will look up the official maps and c if L can be determined once im off night shift Edited 8 March by Dirty Harry additional info Link to comment Share on other sites More sharing options...

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