With great difficulty and usually involving much scientific work. A gas chromatograph is probably best, but you won't find one at your local hardware store and you will need an expert to interpret the results.
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To find one tenth of a number, multiply the number by 0.1, or divide the number by 10.
To find one tenth of a number, multiply the number by 0.1. For example, one tenth of 23 is equal to 23 x 0.1 = 2.3
You can place a string around the head, and then measure the string. Or measure directly with a measuring tape, if you have one that is flexible enough (basically, a measuring tape made up of cloth or something similar).