[thedy]

It holds,that A pi bond is weaker than a sigma bond, but the combination of pi and sigma bond is stronger than either bond by itself.So,essential acids in oil have more pi and sigma bonds,like in a fat,which is in solid state.That means it could be in solid state,not liquid,but it is not like that.Why?I think that,if a chemical compund has more double bonds,it is in solid state,and if compound has more simple bonds it is in liquid state,isn it?

Thanks

[Doc Oc]

The physical state of saturated and unsaturated fats has nothing to do with the strength of the sigma and pi bonds, it has to do with the way they stack together.  Unsaturated fats have kinks in their tails that make it difficult for them to pack together tightly, so they're oil at room temp.  Saturated fats don't have these kinks and therefore pack together nicely like puzzle pieces and are solid at room temp.  If you hydrogenate an unsaturated fat it will become a solid at room temp (hence, margarine).

[thedy]

Thanks a lot for answer:)