the gain of energy causes the molecules to vibrate and bounce off each other, causing them to become farther apart.
Warmer things are less dense, so as the molasses gets warmer, it becomes less dense or more "liquidy."
When heated, gases typically expand and become less dense. So, a gas would be least dense when heated.
The wax substance is more dense than the liquid when cool and less dense than the liquid when heated. The wax moves by density convection.
Things (almost everything, including air) becomes less dense when it is heated. So warm air rises, and cold air falls.
Actually, heated materials are less dense. When heat is applied to a substance such as liquid, it becomes less dense. It is this less dense and heated material that rises because it weighs less. The part of the mantle that is more dense would be any substance that is cooling and is sinking down.
The particles get further away from each other as water is heated therefore making it less dense
In general, hot means the substance is less dense. Less dense things tend to rise when they are in more dense things.
It becomes less dense.
Heated particles are not actually lighter. What happens is that heated particles require more area. This increase in area is observed as an increase in volume. This reduces the number of particle in a given space. This means that the heated air is less dense. Due to buoyancy, things that are less dense "float" on top of denser things. This is why a hot air balloon rises.
On heating the inter molecular space decreases. So, substance becomes less dense on heating.
bubbles rise to the surface of a heated liquid as it changes to gas because they are less dense than the liquid.
It expands, rises, and becomes less dense.