Oils can be converted to fats by a commercial process catalyzed bynickel which is called partial hydrogenation. In relatively mild conditions (180ºC and pressures of about 1.33 atm) a sufficient number of double bonds are hydrogenated and solidify liquid oils. This solid material, margarine, has a consistency similar to butter. Come up with a practical reason why oils don'tthey are completely hydrogenated during commercial hydrogenation processes.

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