1.
the wood is a solid, salad oil is a liquid and Oxygen is a gas.
2.
the wood would stay the same, as the wood is a solid substance like a table or a metal poll, the water would become a puddle, and the oxygen would join in with the air, like steam does or smoke.
3.
If they get moved to a bigger container. The wood, would keep the same amount as it is a solid and keeps the same form, the salad oil and the oxygen would get a larger volume because it has more area to cover.
I hope this helps <3