Imagine that you could hold two atoms that are bonded together, twist them, and not change the bond length. would it be easier to twist (rotate) around a single σ bond or around a double σ plus π bond, or would they be the same?

it is easier to rotate and single bond rather than a double bond made of a sigma bond and pi bond

Explanation:

Rotation around a single bond happens easily but it is very limited around a double bond because of the overlapping electron cloud above and below the imaginary axis between the two atoms.

the cold front replaces the warmer air at the ground level changing the wind to be breezy and denser.there is also an immediate drop in the temperature.