Question

Why butter is solid and oli is liquid?

Answer 1

because butter solid substance which have molecules and atoms. and oil is liquid because they have loose molecules

Answer 2

butter is an animal fat. animal fats have saturated fatty acid which pack together by weak interactions so they are solid at room temp.
corn oil is a vegetable oil and has plant fats. the interactions in plant fats aren't stable becouse they have kinks in their fatty acid tails