Trans Fat Question...Partially hydrogenated makes it trans?

Does the process of taking hydrogen and oil make it a trans fat? How come on most food we eat says "partially hydrogenated"/ oil but has no trans fat on the nutrition guide. Wouldnt those have trans fat because of the process used with the oil? How come vegetable and soybean partially hydrogenated oil... show more Does the process of taking hydrogen and oil make it a trans fat? How come on most food we eat says "partially hydrogenated"/ oil but has no trans fat on the nutrition guide. Wouldnt those have trans fat because of the process used with the oil? How come vegetable and soybean partially hydrogenated oil does not have trans fat? Ive been wondering this.
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