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If have a container with a capacity of 5,000 cubic inches, how do I calculate the ratio of 50 ppm? I would describe the problem as,

1.) statements,

a/b = 50/1,000,000 a = ? b = 5,000 

2.) show your work,

Establish the ratio of the ppm ratio and "to be scaled"* volume

50/1,000,000 = a/5,000 

Cross multiply,

a1,000,000 = 50*5,000 a = .25 

3.) the full answer,

The fraction of liquid (a) to liquid (b) is  0.25 cu. in. of liquid (a), to 5,000 cu. in. of liquid (b). 

4.) Check my work,

(0.25/5,000) = 0.00005 = (50/1,000,000) 

Is this correct? Is there a simpler way?


* I'm making this ratio fraction problem simple and not using the "total" volume.

1 Answers 1